Loss Contingency, Damages Type [Axis] Loss Contingency, Damages Type [Axis] Loss Contingency, Damages Type Common Stock, Dividends, Per Share, Cash Paid Common Stock, Dividends, Per Share, Cash Paid Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Restatement [Axis] Revision of Prior Period [Axis] Community Health Systems, Inc. (Outreach Business) Community Health Systems, Inc. (Outreach Business) [Member] Community Health Systems, Inc. (Outreach Business) Statistical Measurement [Domain] Statistical Measurement [Domain] Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination [Abstract] Business Combination [Abstract] Schedule of Short-Term Debt [Table Text Block] Schedule of Short-Term Debt [Table Text Block] Business Combination, Recognized Liability Assumed, Liability, Current Business Combination, Recognized Liability Assumed, Liability, Current Award Timing Predetermined Award Timing Predetermined [Flag] 4.80% senior notes due 2034 4.80% senior notes due 2034 4.80% senior notes due 2034 Intangible Assets, Gross (Excluding Goodwill) Intangible Assets, Gross (Excluding Goodwill) Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Empire City Laboratories, Inc. Empire City Laboratories, Inc. [Member] Empire City Laboratories, Inc. Business Combination, Goodwill, Expected Tax Deductible, Amount Business Combination, Goodwill, Expected Tax Deductible, Amount Asset Class [Axis] Asset Class [Axis] Entity File Number Entity File Number Per Share Amount [Abstract] Per Share Amount [Abstract] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Commons Stock Issued During Period Shares Employee Stock Plans Commons Stock Issued During Period Shares Employee Stock Plans Number of common shares issued during the period as a result of an employee stock purchase plan and/or stock option plan. Equity method loss, net Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Provision for income tax related to items of comprehensive earnings Other Comprehensive Income (Loss), Tax Unbilled services, net Unbilled Contracts Receivable New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] O2025Q2Dividends [Member] O2025Q2Dividends [Member] 2025Q1Dividends Operating Activities [Axis] Operating Activities [Axis] Decrease in accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Unbilled services, net Contract with Customer, Asset, after Allowance for Credit Loss, Current Goodwill [Line Items] Goodwill [Line Items] Net share settlement tax payments from issuance of stock to employees Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Initial Damages Initial Damages [Member] Initial Damages Basic earnings per share (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Document Information, Document [Axis] Document Information, Document [Axis] REVENUES Revenue from Contract with Customer [Text Block] Supplies Expense Supplies Expense Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Other comprehensive (loss) earnings, net of tax Other comprehensive earnings, net of tax Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Interest Interest Paid In Cash The amount of cash paid during the current period for interest owed on money borrowed Adjustment to Compensation, Amount Adjustment to Compensation Amount Stock compensation Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] 4.55% senior notes due 2032 4.55% senior notes due 2032 4.55% senior notes due 2032 Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Third party [Member] Third party [Member] Third party [Member] Tax effect of adjustments Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Proceeds from sale or distribution of equity affiliates or other investments Proceeds from Sale of Other Investments Payments to Acquire Equity Method Investments Payments to Acquire Equity Method Investments Goodwill and other asset impairments Asset Impairment Charges Asset Impairment Charges Total shareholders’ equity BALANCE BALANCE Equity, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Insider Trading Policies and Procedures [Line Items] Common Stock, Shares Authorized Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Current assets: Current Assets: Assets, Current [Abstract] Total liabilities and shareholders’ equity Liabilities and Equity Foreign Currency Transactions and Translations, Policy Foreign Currency Transactions and Translations Policy [Policy Text Block] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Allowance for Credit Loss Allowance for Credit Loss Allowance for Credit Loss Canadian and other licenses [Member] Licensing Agreements [Member] Diagnostics Diagnostics [Member] Diagnostics [Member] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Long term debt issuance costs Long term debt issuance costs Long term debt issuance costs Derivative, Interest Rate Swap Derivative, Interest Rate Swap Derivative, Interest Rate Swap Maximum [Member] Maximum [Member] NumberOfForeignCurrencyDerivativesHeld Entered in Q1 2024 NumberOfForeignCurrencyDerivativesHeld Entered in Q1 2024 NumberOfForeignCurrencyDerivativesHeld Entered in Q1 2024 Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Less: Net earnings attributable to the noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Finite Lived Intangible Assets Net Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Deferred compensation liability Fair Value Liabilities Measured On Recurring Basis Deferred Compensation Liability Fair Value Liabilities Measured On Recurring Basis Deferred Compensation Liability Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] BUSINESS ACQUISITIONS AND DISPOSITIONS Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Shell Company Entity Shell Company Other liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from sale of assets Proceeds from Sale of Property, Plant, and Equipment Decrease in unearned revenue Increase (Decrease) in Deferred Revenue Statement of Financial Position Location, Activity, Accrual [Axis] Statement of Financial Position Location, Activity, Accrual [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Comprehensive earnings attributable to Labcorp Holdings Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Issuance of common stock under employee plans Issuance of common stock under employee plans Aggregate change in value for stock issued in period under ESPP combined with the value of stock issued as a result of option exercises. Short-term operating lease liabilities Operating Lease, Liability, Current Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Patents, Licenses And Technology [Member] Patents, Licenses And Technology [Member] Patents are the exclusive legal right granted by the government to the owner of the patent to exploit an invention or a process for a period of time specified by law. Licenses are rights, generally of limited duration, under a license arrangement (for example, to sell or otherwise utilize specified products or processes in a specified territory). Technology-based intangible assets are innovations or scientific advances that have not been patented. Document Fiscal Period Focus Document Fiscal Period Focus Credit Facility Option to Increase Credit Facility Option to Increase Credit Facility Option to Increase Fair market value of senior notes Senior Notes Fair Value Estimated fair value of the debt instrument (senior notes) at the balance-sheet date Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] BioReference Health (Oncology Focused) BioReference Health [Member] BioReference Health Legal Entity [Axis] Legal Entity [Axis] Business Combination, Pro Forma Information [Table Text Block] Business Combination, Pro Forma Information [Table Text Block] Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Estimated amortization expense, Remainder of 2025 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Unbilled Services, Foreign Currency Translation Impact Unbilled Services, Foreign Currency Translation Impact Unbilled Services, Foreign Currency Translation Impact Noncontrolling Interest Puts [Abstract] Noncontrolling Interest Puts [Abstract] Noncontrolling Interest Puts [Abstract] Net Benefit Plan Adjustments, Beginning balance Net Benefit Plan Adjustments, Ending balance Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Geographical [Domain] Geographical [Domain] Operating lease right-of-use asset expense Depreciation And Amortization Of Leased Assets The amount of depreciation recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Also, may include amortization charged against earnings for the periodic recognition of capitalized leases. Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Intangible Assets and Goodwill [Table Text Block] Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Business Combination, Pro Forma Information [Line Items] Business Combination, Pro Forma Information [Line Items] BASIS OF FINANCIAL STATEMENT PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Other comprehensive income before reclassifications Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Notes Payable, Noncurrent Notes Payable, Noncurrent Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Loss Contingency, Damages Awarded, Value Loss Contingency, Damages Awarded, Value Estimated amortization expense, 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company Dividends Payable, Date Declared Dividends Payable, Date Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Business Combination, Recognized Asset Acquired, Asset Business Combination, Recognized Asset Acquired, Asset Payments on revolving credit facilities Repayments of Lines of Credit Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Client [Member] Client [Member] Client [Member] Proceeds from accounts receivable securitization Proceeds from Accounts Receivable Securitization Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill) Business Combination [Domain] Business Combination [Domain] Common stock 83.0 and 83.4 shares outstanding at September 30, 2025, and December 31, 2024, respectively Common Stock, Shares, Outstanding Accounts Receivable, Credit Loss Expense (Reversal) Accounts Receivable, Credit Loss Expense (Reversal) Document Information [Table] Document Information [Table] PEO PEO [Member] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Restructuring and other charges Net restructuring and other special charges Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program planned and controlled by management, and materially changes either the scope or manner of conduct of a business undertaken. Also, may include reversals and other adjustments to accrued liabilities and special charges, if any, for asset abandonment, uncollectible balances, etc. Proceeds from senior note offerings Proceeds from Issuance of Senior Long-Term Debt Unbilled Contracts Receivable [Member] Unbilled Contracts Receivable [Member] Unbilled Contracts Receivable [Member] Post Verdict Supplemental Damages Post Verdict Supplemental Damages [Member] Post Verdict Supplemental Damages UNITED STATES UNITED STATES Change in assets and liabilities (net of effects of acquisitions and divestitures): Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Retained Earnings [Member] Retained Earnings [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Change in accrued property, plant, and equipment Increase in Capital Expenditures Incurred but not yet Paid Increase in Capital Expenditures Incurred but not yet Paid Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Rollforward of common shares issued Common Shares Issued Rollforward [Abstract] Document Information [Table] Document Information [Line Items] Statement of Financial Position Location, Activity, Capitalization [Axis] Statement of Financial Position Location, Activity, Capitalization [Axis] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Enhanced Damages Enhanced Damages [Member] Enhanced Damages Product and Service [Domain] Product and Service [Domain] Fair Value, Liabilities Measured on Recurring Basis, Disclosure Items [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Dividends Payable, Date of Record Dividends Payable, Date of Record Net earnings Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Equipment Derivative, Notional Amount Derivative, Notional Amount 2034 Swap Agreements [Member] 2034 Swap Agreements [Member] 2034 Swap Agreements Less: reserve for unbilled services Allowance for Credit Loss, Receivable, Other, Current Organization, Consolidation and Presentation of Financial Statements [Abstract] Changes in common shares issued and held in treasury Changes In Common Shares Issued And Held In Treasury [Table Text Block] Schedule is used to show the changes in common shares issued and held in treasury by the entity. Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Goodwill acquired during the period Goodwill, Acquired During Period City Area Code City Area Code Dividends Payable, Amount Per Share Dividends Payable, Amount Per Share Financing Receivable, Allowance for Credit Loss [Table Text Block] Financing Receivable, Allowance for Credit Loss [Table Text Block] Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued expenses and other Accrued Liabilities, Current United States of America, Dollars United States of America, Dollars Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Noncontrolling interest Noncontrolling Interest Mezzanine Equity Represents contractual value of a noncontrolling interest put (includes underlying noncontrolling interest). In February 2010, the Company completed a transaction to sell the partnership units acquired from the previous noncontrolling interest holder to a new Canadian partner. As a result of this transaction, the Company recorded a component of noncontrolling interest in liabilities and a component in mezzanine equity. This item represents the mezzanine equity component. Proceeds from revolving credit facilities Proceeds from Long-Term Lines of Credit Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Number Of Foreign Currency Derivatives Held Entered in Q3 2024 Number Of Foreign Currency Derivatives Held Entered in Q3 2024 Number Of Foreign Currency Derivatives Held Entered in Q3 2024 Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Subsequent Event [Member] Subsequent Event [Member] Earnings from operations before income taxes Earnings before income taxes Income (Loss) from Continuing Operations Before Income Taxes and Noncontrolling Interest Income (Loss) from Continuing Operations Before Income Taxes and Noncontrolling Interest Goodwill, net Balance as of December 31, 2024 Balance as of September 30, 2025 Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Swap Swap [Member] Cash paid during period for: Cash Paid During Period For [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Revolving Credit Facility, amount outstanding Revolving Credit Facility, amount outstanding Revolving Credit Facility, amount outstanding Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Entity Address, State or Province Entity Address, State or Province Euro Member Countries, Euro Euro Member Countries, Euro Allowance for Credit Loss, Foreign Currency Translation Impact Allowance for Credit Loss, Foreign Currency Translation Impact Allowance for Credit Loss, Foreign Currency Translation Impact Dividends Dividends declared Dividends Total current liabilities Liabilities, Current Derivative Instruments, Gain (Loss) by Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Additional paid-in capital Additional Paid in Capital, Common Stock Entity [Domain] Entity [Domain] Net cash used for investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Joint venture partnerships and equity method investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Gain (Loss) on Disposition of Business Gain (Loss) on Disposition of Business Document Fiscal Year Focus Document Fiscal Year Focus Basis of Accounting, Policy Basis of Accounting, Policy [Policy Text Block] Lender Name [Axis] Lender Name [Axis] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Subsidiary, Ownership Percentage, Noncontrolling Owner Subsidiary, Ownership Percentage, Noncontrolling Owner Deferred compensation asset Deferred Compensation Plan Assets Entity Interactive Data Current Entity Interactive Data Current Royalty Damages [Member] Royalty Damages [Member] Royalty Damages Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Loss Contingency, Damages Type [Domain] Loss Contingency, Damages Type [Domain] Loss Contingency, Damages Type [Domain] North America North America [Member] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] BUSINESS SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Ownership [Domain] Ownership [Domain] Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Credit Facility, Maximum Swing Line Borrowings Credit Facility, Maximum Swing Line Borrowings Credit Facility, Maximum Swing Line Borrowings Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Fair Value, Liabilities Measured on Recurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangibles and other assets Amortization of intangible assets Amortization of Intangible Assets Amortization of Intangible Assets Selling, general, and administrative expenses Selling, General and Administrative Expense 2.95% senior notes due 2029 2.95% senior notes due 2029 2.95% senior notes due 2029 Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Other assets, net Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Foreign Currency Translation Adjustments, Beginning balance Foreign Currency Translation Adjustments, Ending balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Revenues Revenues Other comprehensive income (loss), Cross Currency Swaps Other comprehensive income (loss), Cross Currency Swaps Other comprehensive income (loss), Cross Currency Swaps Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Currency Swap Currency Swap [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility [Member] Revolving Credit Facility [Member] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Deferred Revenue, Revenue Recognized Deferred Revenue, Revenue Recognized Segments [Axis] Segments [Axis] Segments [Axis] Decrease (increase) in prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Swap, Type [Axis] Swap, Type [Axis] Swap, Type Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Europe [Member] Europe [Member] Other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Subsequent Event Type [Axis] Subsequent Event Type [Axis] Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill ASSETS Assets [Abstract] Long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Estimated amortization expense, 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Three Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Other countries [Member] Other countries [Member] Other countries [Member] Net proceeds from issuance of stock to employees Net proceeds from issuance of stock to employees The cash inflow associated with the amount received from holders exercising their stock options and employees related to shares purchased under the employee stock purchase plan. FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Shareholders' equity: Shareholders' Equity: Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Accumulated Other Comprehensive Income [Member] AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Decrease in accrued expenses and other Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Operating lease liabilities Operating Lease, Liability, Noncurrent Accounts receivable securitizaiton Accounts receivable securitizaiton [Member] Accounts receivable securitizaiton Ownership [Axis] Ownership [Axis] Short-term borrowings and current portion of long-term debt Short Term Debt and Along Term Debt Current Maturities Short Term Debt and Along Term Debt Current Maturities Medicare and Medicaid [Member] Medicare and Medicaid [Member] Medicare and Medicaid [Member] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Customer Lists Customer Lists [Member] Goodwill Impairment, Cumulative Goodwill Impairment, Cumulative Goodwill Impairment, Cumulative Other acquirees Other acquirees [Member] Other acquirees [Member] Labor and Related Expense Labor and Related Expense Schedule of Long-Term Debt Instruments [Table Text Block] Schedule of Long-Term Debt Instruments [Table Text Block] Deferred Tax Asset Acceleration Over Next Two Years Deferred Tax Asset Acceleration Over Next Two Years Deferred Tax Asset Acceleration Over Next Two Years Dilutive effect of employee stock options and awards, (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Payments to Acquire Investments Payments to Acquire Investments Document Quarterly Report Document Quarterly Report Restatement [Domain] Revision of Prior Period [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Level 3 Rollforward [Line Items] Level 3 Rollforward [Line Items] Level 3 Rollforward [Line Items] Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Accounts Receivable [Member] Accounts Receivable [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Reporting Unit [Axis] Reporting Unit [Axis] Other, net Proceeds from (Payment for) Other Financing Activity Business Combination, Pro Forma Information [Table] Business Combination, Pro Forma Information [Table] Self-Pay [Member] Self-Pay [Member] Company's population of financial assets and liabilities subject to fair value measurements Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Intangible Assets Other Intangible Assets [Member] All Currencies [Domain] All Currencies [Domain] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Short term debt issuance costs Short term debt issuance costs Short term debt issuance costs Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Swap, Type [Domain] Swap, Type [Domain] Swap, Type [Domain] Tax effect of adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Current Portion of Long-term Debt Current Portion of Long-term Debt [Member] Current Portion of Long-term Debt Reporting Unit [Domain] Reporting Unit [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Three month LIBOR Three month LIBOR Three month LIBOR Additions from business acquisitions Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Stock compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive loss Accumulated Other Comprehensive Earnings, Beginning balance Accumulated Other Comprehensive Earnings, Ending balance Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Earnings [Roll Forward] Accumulated Other Comprehensive Earnings [Roll Forward] Accumulated Other Comprehensive Earnings [Roll Forward] Contingent consideration Contingent Consideration Classified as Equity, Fair Value Disclosure Liability Class [Axis] Liability Class [Axis] Segments [Domain] Segments [Domain] Segments [Domain] Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Liabilities Measured on Recurring Basis, Disclosure Items [Domain] Fair Value Hierarchy and NAV [Domain] Freight Freight Freight Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] (Increase) decrease in supplies inventory Increase (Decrease) in Inventories Statement of Financial Position Location, Activity, Capitalization [Domain] Statement of Financial Position Location, Activity, Capitalization [Domain] Supplies inventory Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum [Member] Minimum [Member] Total business acquisitions and adjustments Total business acquisitions and adjustments [Member] Total business acquisitions and adjustments Earnings Per Share, Policy Earnings Per Share, Policy [Policy Text Block] Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax DEBT Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Unbilled Services, Allowance for Credit Loss Unbilled Services, Allowance for Credit Loss Unbilled Services, Allowance for Credit Loss Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other comprehensive (loss) earnings before tax Other Comprehensive Income (Loss), before Tax Business Combination, Recognized Liability Assumed, Liability Business Combination, Recognized Liability Assumed, Liability Senior notes due 2029 and 2034 Senior notes due 2029 and 2034 [Member] Senior notes due 2029 and 2034 Net Income (Loss) Available to Common Stockholders Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Payments on senior notes Repayments of Senior Debt Common stock 83.0 and 83.4 shares outstanding at September 30, 2025, and December 31, 2024, respectively Common Stock, Value, Issued Goodwill [Roll Forward] Goodwill [Roll Forward] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Operating Activities [Domain] Operating Activities [Domain] Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Commitments and contingent liabilities Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 2029 Swap Agreements 2029 Swap Agreements [Member] 2029 Swap Agreements Business Combination [Axis] Business Combination [Axis] Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Other Cost and Expense, Operating Other Cost and Expense, Operating SYNLAB SYNLAB [Member] SYNLAB Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding 2031 and 2034 Swap Agreements 2031 and 2034 Swap Agreements [Member] 2031 and 2034 Swap Agreements Document Transition Report Document Transition Report Deferred income taxes and other tax liabilities Deferred income taxes and other tax liabilities Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax, combined with the noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. Noncontrolling Interest [Table] Noncontrolling Interest [Table] Underlying Securities Award Underlying Securities Amount Short-term Debt [Line Items] Short-Term Debt [Line Items] Other Comprehensive Income (Loss), before Reclassifications, before Tax Other Comprehensive Income (Loss), before Reclassifications, before Tax Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount AR facility Long-Term Line of Credit, Noncurrent Cash surrender value of life insurance policies Cash Surrender Value, Fair Value Disclosure Noncontrolling interest put Fair Value Liabilities Measured On Recurring Basis Noncontrolling Interest Puts This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Less: BLS allowance for credit losses Accounts Receivable, Allowance for Credit Loss Ownership percentage below which investments are generally accounted for on the cost method (in thousandths) Cost Method Investments Maximum Ownership Percentage This element represents the maximum ownership percentage of cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Scenario [Axis] Scenario [Axis] Measurement Period Adjustments Measurement Period Adjustments [Member] Measurement Period Adjustments Allowance for Credit Loss, Write Off Allowance for Credit Loss, Write Off Allowance for Credit Loss, Write Off Shares Acquired, Average Cost Per Share Shares Acquired, Average Cost Per Share Document Type Document Type Level 3 [Member] Fair Value, Inputs, Level 3 [Member] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Product and Service [Axis] Product and Service [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Income [Abstract] Income [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Credit Facility, Maximum Letters of Credit Credit Facility, Maximum Letters of Credit Credit Facility, Maximum Letters of Credit Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Payment, Tax Withholding, Share-based Payment Arrangement Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Finite Lived Intangible Assets Net Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Current liabilities: Liabilities, Current [Abstract] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Business Combination, Pro Forma Information, Pro Forma Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Unearned revenue Deferred Revenue, Current Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Disclosure of non-cash financing and investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Dividends [Axis] Dividends [Axis] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Noncompete Agreements [Member] Noncompete Agreements [Member] Consolidation Items [Domain] Consolidation Items [Domain] Proceeds from Equity Method Investment, Distribution, Return of Capital Proceeds from Equity Method Investment, Distribution, Return of Capital Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Subordinated Borrowing, Interest Rate Subordinated Borrowing, Interest Rate Gross profit Gross Profit Potential common shares not included in computation of diluted earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Purchase of common stock Stock Repurchased and Retired During Period, Value Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Income taxes, net of refunds Income Taxes Paid, Net Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Estimated amortization expense, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] PREFERRED SSTOCK AND COMMON SHAREHOLDERS' EQUITY Equity [Text Block] Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Net benefit plan adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Net earnings attributable to Labcorp Holdings Inc. Net earnings attributable to Labcorp Holdings Inc. Net Income (Loss) Attributable to Parent Dividends [Domain] Dividends [Domain] Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Payment Due at Closing Payment Due at Closing Payment Due at Closing Estimated amortization expense, 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Five Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Property, plant, and equipment, net Property, Plant and Equipment, Net 2.70% senior notes due 2031 Senior notes due 2031 [Member] Senior notes due 2031 Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Biopharma Laboratory Services Biopharma Laboratory Services [Member] Biopharma Laboratory Services Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Purchase of common stock Purchase of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Increase in accounts receivable Increase (Decrease) in Accounts Receivable Line of Credit Facility, Commitment Fee Description Line of Credit Facility, Commitment Fee Description Entity Current Reporting Status Entity Current Reporting Status 4.35% senior notes due 2030 4.35% senior notes due 2030 4.35% senior notes due 2030 Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer Relationships [Member] Customer Relationships [Member] Operating income Operating income Operating Income (Loss) Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Corporate Segment [Member] Corporate Segment [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Short-term finance lease liabilities Finance Lease, Liability, Current Interest expense Interest Expense, Operating and Nonoperating Class of Stock [Axis] Class of Stock [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Effect of exchange rate changes on Cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Variable Rate [Domain] Variable Rate [Domain] Document [Domain] Document [Domain] Financing lease liabilities Finance Lease, Liability, Noncurrent Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Employee stock options and awards Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Accounts Receivable, Credit Loss Expense (Reversal) Accounts Receivable, Foreign Currency Translation Impact Accounts Receivable, Foreign Currency Translation Impact Termination Date Trading Arrangement Termination Date Net Restructuring Charges Net Restructuring Charges Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and changes either scope of business by an entity, or manner business is conducted. May include amount of reversals and other adjustments during the period to amounts of previously accrued liabilities for specified types of restructuring costs. Schedule Of Other Intangible Assets By Major Class [Domain] Schedule Of Other Intangible Assets By Major Class [Domain] Net cash (used for) provided by for financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Decrease in unbilled services Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Gross unbilled services Contract with Customer, Asset, before Allowance for Credit Loss Estimated amortization expense, Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Foreign currency impact and other adjustments to Goodwill Goodwill, Foreign Currency Translation and Measurement Period Adjustments Net earnings, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Reconciliation of Basic earnings per Share to Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement of Financial Position Location, Activity, Accrual [Domain] Statement of Financial Position Location, Activity, Accrual [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Cost of revenues Cost of Revenue Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Accounts Receivable, before Allowance for Credit Loss Accounts Receivable, before Allowance for Credit Loss 3.60% senior notes due 2027 3.60% senior notes due 2027 3.60% senior notes due 2027 Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount 3.60% senior notes due 2025 3.60% senior notes due 2025 3.60% senior notes due 2025 Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common shares issued, beginning balance (in shares) Common shares issued, ending balance (in shares) Common Stock, Shares, Issued 2.70% senior notes due 2031 2.70% senior notes due 2031 2.70% senior notes due 2031 GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] 4.70% senior notes due 2045 4.70% senior notes due 2045 4.70% senior notes due 2045 Payments of Dividends Payments of Dividends Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Proceeds from sale of business Proceeds from Sales of Business, Affiliate and Productive Assets Loss Contingencies [Line Items] Loss Contingencies [Line Items] Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Cross currency swaps Foreign Currency Contracts, Liability, Fair Value Disclosure Goodwill and other asset impairments Goodwill and Intangible Asset Impairment Goodwill and Intangible Asset Impairment Total liabilities Liabilities Currency [Axis] Currency [Axis] Revolving Credit Facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Investment income Investment Income, Net 1.55% senior notes due 2026 1.55% senior notes due 2026 1.55% senior notes due 2026 Biopharmaceutical and medical device companies [Member] Biopharmaceutical and medical device companies [Member] Biopharmaceutical and medical device companies [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Interest rate swaps Fair Value Hedges, Net Schedule Of Other Intangible Assets By Major Class [Axis] Schedule Of Other Intangible Assets By Major Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Prepaid expenses and other Prepaid Expense, Current Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Percent of Revenue Contributed Percent of Revenue Contributed Percent of Revenue Contributed Asset Class [Domain] Asset Class [Domain] Earnings per share: Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Common Stock [Member] Common Stock [Member] Level 3 Rollforward [Table] Level 3 Rollforward [Table] Level 3 Rollforward [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net (decrease) increase in Cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Notes Payable Notes Payable, Current