Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Corewell Health Venture
Corewell Health Venture [Member]
Corewell Health Venture
Weighted average common shares outstanding:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Trading Arrangement:
Trading Arrangement [Axis]
Maximum
Maximum [Member]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Title of 12(b) Security
Title of 12(b) Security
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
Net Income (Loss) Available to Common Stockholders, Diluted
Document Fiscal Year Focus
Document Fiscal Year Focus
Provision for credit losses
Contract with Customer, Asset, Credit Loss Expense (Reversal)
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Fixed-to-variable interest rate swaps
Interest Rate Fair Value Hedge Liability at Fair Value
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Restructuring Plan [Axis]
Restructuring Plan [Axis]
Common stock, par value $0.01 per share; 600 shares authorized as of both June 30, 2026 and December 31, 2025; 162 shares issued as of both June 30, 2026 and December 31, 2025
Common Stock, Value, Issued
Employee payroll tax withholdings on stock issued under stock-based compensation plans
Payment, Tax Withholding, Share-Based Payment Arrangement
Schedule of Long-Term Debt Instruments
Schedule of Long-Term Debt Instruments [Table Text Block]
Excludes general and professional liability claims
Excludes general and professional liability claims [Member]
Excludes general and professional liability claims [Member]
Restatement Determination Date
Restatement Determination Date
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Schedule of Shareholders' Equity [Line Items]
[Line Items] for Schedule of Shareholders' Equity [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
6.40% Senior Notes due November 2033
Six Point Four Zero Percent Senior Notes due June 2033 [Member]
Six Point Four Zero Percent Senior Notes due June 2033
5.00% Senior Notes due June 2036
Five Point Zero Zero Percent Senior Notes due June 2036 [Member]
Five Point Zero Zero Percent Senior Notes due June 2036
Amendment Flag
Amendment Flag
Restructuring and impairment charges
Total restructuring and impairment charges
Restructuring Costs and Asset Impairment Charges
Current liabilities:
Liabilities, Current [Abstract]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Loss Contingencies [Table]
Loss Contingencies [Table]
UMass Joint Venture
UMass Joint Venture [Member]
UMass Joint Venture [Member]
Net income
Net Income (Loss), Excluding Redeemable Noncontrolling Interest
Net Income (Loss), Excluding Redeemable Noncontrolling Interest
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Entity Address, State or Province
Entity Address, State or Province
PEO Total Compensation Amount
PEO Total Compensation Amount
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Foreign currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Additional, Reimbursement Coverage
Additional, Reimbursement Coverage [Member]
Additional, Reimbursement Coverage
Intangible assets, net
Intangible Asset, Excluding Goodwill, after Accumulated Amortization
Notional amount
Notional Amount
Derivative, Notional Amount
Basic (in shares)
Weighted average common shares outstanding - basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Number of reportable segments
Number of Reportable Segments
Total current liabilities
Liabilities, Current
Percentage of net revenues
Percentage of Net Revenues
Percentage of Net Revenues
Customer-related intangibles
Customer Relationships [Member]
Schedule of Derivative Instruments
Schedule of Derivative Instruments [Table Text Block]
Leases:
Lease, Cost [Abstract]
Entity Address, City or Town
Entity Address, City or Town
Supplemental Cash Flow and Other Data
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Pending Litigation
Pending Litigation [Member]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Capitated
Capitated [Member]
Capitated [Member]
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Significant Other Observable Inputs, Level 2
Fair Value, Inputs, Level 2 [Member]
Other income (expense):
Nonoperating Income (Expense) [Abstract]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Three Point Four Five Percent Senior Notes due June 2026
Three Point Four Five Percent Senior Notes due June 2026 [Member]
Three Point Four Five Percent Senior Notes due June 2026 [Member]
Credit facility capacity
Line of Credit Facility, Maximum Borrowing Capacity
Other comprehensive (loss) income
Other comprehensive income (loss), net of taxes
Net current period other comprehensive (loss) income
Other Comprehensive Income (Loss), Net of Tax
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Less: Current portion of long-term debt
Current portion of long-term debt
Long-Term Debt, Current Maturities
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Treasury stock, at cost; 52 shares as of both June 30, 2026 and December 31, 2025
Treasury Stock, Value
New Accounting Standards to be Adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Litigation Case [Axis]
Litigation Case [Axis]
Accounts payable associated with capital expenditures
Capital Expenditures Incurred but Not yet Paid
Summary of Segment Reporting Information by Segment
Segment Reporting [Table Text Block]
Non- controlling Interests
Noncontrolling Interest [Member]
Use Of Estimates
Use of Estimates, Policy [Policy Text Block]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Total long-term debt
Total long-term debt
Long-Term Debt
Fair value basis adjustments attributable to hedged debt
Debt Instrument, fair value basis adjustment attributable to hedged debt
Debt Instrument, fair value basis adjustment attributable to hedged debt
Income taxes payable
Increase (Decrease) in Income Taxes Payable
Document Period End Date
Document Period End Date
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Net cash used in investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Comparable Company Revenue Volatility
Measurement Input, Comparable Company Revenue Volatility [Member]
Measurement Input, Comparable Company Revenue Volatility [Member]
Face amount
Debt Instrument, Face Amount
STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST
Equity [Text Block]
Security Exchange Name
Security Exchange Name
SUPPLEMENTAL CASH FLOW & OTHER DATA
Cash Flow, Supplemental Disclosures [Text Block]
Total
Liabilities, Fair Value Disclosure
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Entity Shell Company
Entity Shell Company
Total fair value adjustments included in earnings - realized/unrealized
Total fair value adjustments included in earnings - unrealized
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Current portion of long-term operating lease liabilities
Operating Lease, Liability, Current
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
EARNINGS (LOSS) PER SHARE
Earnings Per Share [Text Block]
Name
Outstanding Recovery, Individual Name
Earnings per share attributable to Quest Diagnostics’ common stockholders:
Earnings Per Share [Abstract]
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
Accounts Receivable Disaggregation
Accounts Receivable Disaggregation [Table Text Block]
Accounts Receivable Disaggregation [Table Text Block]
Document Fiscal Period Focus
Document Fiscal Period Focus
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Proceeds from (repayments of) bank overdrafts
Proceeds from (Repayments of) Bank Overdrafts
Deferred compensation trading securities
Debt Securities, Trading, and Equity Securities, FV-NI
Operating lease assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets
Trading Symbol
Trading Symbol
Discount rate
Measurement Input, Discount Rate [Member]
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
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]
Equity investments
Equity Securities, FV-NI, Excluding Deferred Compensation Trading Securities
Equity Securities, FV-NI, Excluding Deferred Compensation Trading Securities
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Net accounts receivable
Percentage of Net Accounts Receivable
Percentage of Net Accounts Receivable
Company Selected Measure Name
Company Selected Measure Name
Distributions to noncontrolling interest partners
Payments of Ordinary Dividends, Noncontrolling Interest
Fair Value, Measurement Inputs
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]
Patients (including coinsurance and deductible responsibilities)
Patients [Member]
Patients [Member]
Cash flows from operating activities:
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Compensation Amount
Outstanding Recovery Compensation Amount
Individual:
Individual [Axis]
Percentage of interests acquired
Business Combination, Voting Equity Interest Acquired, Percentage
Diluted (in shares)
Weighted average common shares outstanding - diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Entity Emerging Growth Company
Entity Emerging Growth Company
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
Derivative Financial Instruments
Derivatives, Policy [Policy Text Block]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
FINANCIAL INSTRUMENTS
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Dividends payable
Dividends Payable
Goodwill, expected tax deductible amount
Business Combination, Goodwill, Expected Tax Deductible, Amount
Corewell Health
Corewell Health [Member]
Corewell Health
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
2.80% Senior Notes due June 2031
Two Point Eight Zero Percent Senior Notes due June 2031 [Member]
Two Point Eight Zero Percent Senior Notes due June 2031
Other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Operating costs and expenses and other operating income:
Cost of Revenue [Abstract]
Award Timing Predetermined
Award Timing Predetermined [Flag]
DS Businesses
DS Businesses [Member]
DS Businesses [Member]
Description of Business (Abstract)
Description of Business (Abstract)
Description of Business (Abstract)
Treasury Stock, at Cost
Treasury Stock, Common [Member]
Components of Accumulated Other Comprehensive Income (Loss)
Comprehensive Income (Loss) [Table Text Block]
Letters of credit outstanding, amount
Letters of Credit Outstanding, Amount
Employee separation costs
Severance Costs
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
4.70% Senior Notes due March 2045
Four Point Seven Zero Percent Senior Notes due March 2045 [Member]
Four Point Seven Zero Percent Senior Notes due March 2045 [Member]
Stock-based compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Quoted Prices in Active Markets for Identical Assets / Liabilities, Level 1
Fair Value, Inputs, Level 1 [Member]
DIS business
Diagnostic Information Services Business [Member]
Diagnostic Information Services Business [Member]
Litigation Status [Domain]
Litigation Status [Domain]
Stock options and performance share units (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Hedged items (Long-term debt)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
All Executive Categories
All Executive Categories [Member]
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Depreciation expense
Depreciation
Operating lease right-of-use assets
Operating Lease, Right-of-Use Asset
Reissuance of shares for employee benefit plan
Stock Issued During Period, Shares, Treasury Stock Reissued
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
BUSINESS SEGMENT INFORMATION
Segment Reporting [Text Block]
Minimum
Minimum [Member]
Dividends paid
Payments of Ordinary Dividends, Common Stock
Expiration Date
Trading Arrangement Expiration Date
2030
Long-Term Debt, Maturity, Year Four
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Client Payers
Client Payers [Member]
Client Payers [Member]
Effect of exchange rate changes on cash and cash equivalents and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Income Statement Location [Axis]
Location, Statement of Income, Balance [Axis]
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Total stockholders’ equity
Balance
Balance
Equity, Including Portion Attributable to Noncontrolling Interest
Payroll tax credit, CARES Act
Payroll Tax Credit, CARES Act
Payroll Tax Credit, CARES Act
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]
Business Combination [Line Items]
Business Combination [Line Items]
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Derivative [Table]
Derivative [Table]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Intangible assets, useful life
Intangible Asset, Finite-Lived, Useful Life
Exercise Price
Award Exercise Price
Schedule of Restructuring and Related Costs [Table]
Restructuring Cost [Table]
Cash flows from investing activities:
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Litigation Status [Axis]
Litigation Status [Axis]
Segment Reporting [Line Items]
Segment Reporting [Line Items]
Document Quarterly Report
Document Quarterly Report
Cash surrender value of life insurance policies
Cash Surrender Value, Fair Value Disclosure
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]
Segments [Domain]
Segments [Domain]
Interest Rate Swap
Interest Rate Swaps
Interest Rate Swap [Member]
Additional, Based on Revenue
Additional, Based on Revenue [Member]
Additional, Based on Revenue
Income before income taxes and equity in earnings of equity method investees
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
DEBT
Debt Disclosure [Text Block]
Debt issuance costs
Debt Issuance Costs, Net
Contingent Consideration
Contingent Consideration [Member]
Contingent Consideration [Member]
Schedule of Pre-Tax Restructuring and Impairment Charges
Restructuring and Related Costs [Table Text Block]
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Investments in equity method investees
Equity Method Investments
Restructuring reserve
Restructuring Reserve
Business Combination [Table]
Business Combination [Table]
Equity Component [Domain]
Equity Component [Domain]
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Measurement Input Type [Domain]
Measurement Input Type [Domain]
Secured Receivables Credit Facility
Secured Debt [Member]
Trade accounts payable
Accounts Payable, Trade, Current
Total operating costs and expenses, net
Costs and Expenses
Adoption Date
Trading Arrangement Adoption Date
Thereafter
Long-Term Debt, Maturity, after Year Five
Invigorate Program
Invigorate Program [Member]
Invigorate Program [Member]
Debt instrument, interest rate
Debt Instrument, Interest Rate, Stated Percentage
Dividends declared
Dividends, Common Stock, Cash
Total Quest Diagnostics stockholders’ equity
Equity, Attributable to Parent
Total non-operating expense, net
Non-operating expense, net
Nonoperating Income (Expense)
Assets
Assets [Abstract]
Title
Trading Arrangement, Individual Title
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Insider Trading Policies and Procedures [Line Items]
Other financing activities, net
Proceeds from (Payment for) Other Financing Activity
Allowance for doubtful accounts
Accounts Receivable, Allowance for Credit Loss, Current
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Other
Finance Lease Obligations and Other [Member]
Finance Lease Obligations and Other
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Deferred income tax expense
Deferred Income Tax Expense (Benefit)
Selling, general and administrative
Selling, General and Administrative Expense
Repayments of debt
Repayments of Debt
Business Combination [Domain]
Business Combination [Domain]
Interest expense, net
Interest Income (Expense), Nonoperating
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Litigation reserves
Estimated Litigation Liability
Entity Central Index Key
Entity Central Index Key
Additional paid-in capital
Additional Paid in Capital, Common Stock
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Business Combination [Axis]
Business Combination [Axis]
Equity [Abstract]
Equity [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]
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Fair value of joint venture
Fair Value of Joint Venture
Fair Value of Joint Venture
Remainder of 2026
Long-Term Debt, Maturity, Remainder of Fiscal Year
Other comprehensive income (loss) before reclassifications
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Quest Diagnostics stockholders’ equity:
Equity, Attributable to Parent [Abstract]
Income Statement [Abstract]
Income Statement [Abstract]
Document Transition Report
Document Transition Report
Ownership [Axis]
Ownership [Axis]
Mark Delaney [Member]
Mark Delaney
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Designated as Hedging Instrument
Designated as Hedging Instrument [Member]
Restructuring Plan [Domain]
Restructuring Plan [Domain]
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
City Area Code
City Area Code
Changing Comparable Company Revenue Volatility
Changing Comparable Company Revenue Volatility [Member]
Changing Comparable Company Revenue Volatility
Accumulated Other Compre- hensive Loss
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Member]
All Individuals
All Individuals [Member]
General corporate activities
Corporate Segment [Member]
Fair value of debt
Debt Instrument, Fair Value Disclosure
Name
Forgone Recovery, Individual Name
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Schedule of Shareholders' Equity [Table]
Schedule of Shareholders' Equity [Table]
Schedule of Shareholders' Equity [Table]
6.95% Senior Notes due July 2037
Six Point Nine Five Percent Senior Notes Due2037 [Member]
Six Point Nine Five Percent Senior Notes Due 2037 [Member]
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items]
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items]
[Line Items] for Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Table]
Statement [Line Items]
Statement [Line Items]
Total assets
Assets
401(k) Plan Lawsuit
401(k) Plan Lawsuit [Member]
401(k) Plan Lawsuit
Entity [Domain]
Entity [Domain]
Amounts attributable to Quest Diagnostics’ common stockholders:
Income Amounts Attributable to Parent, Disclosures [Abstract]
Business Combination [Abstract]
Business Combination [Abstract]
Interest expense
Interest Expense, Operating
Interest income
Interest and Dividend Income, Operating
Total for line item in which the effects of fair value hedges are recorded
Interest Expense, Nonoperating
Less: Earnings allocated to participating securities
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted
DESCRIPTION OF BUSINESS
Nature of Operations [Text Block]
PEO
PEO [Member]
2028
Long-Term Debt, Maturity, Year Two
Other liabilities
Other Liabilities, Noncurrent
Goodwill
Goodwill
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Exercise of stock options (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
4.20% Senior Notes due June 2029
Four Point Two Zero Percent Senior Notes due June 2029 [Member]
Four Point Two Zero Percent Senior Notes due June 2029 [Member]
Retained Earnings
Retained Earnings [Member]
Long-term operating lease liabilities
Operating Lease, Liability, Noncurrent
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Additional increase
Share Repurchase Program, Additional Increase, Amount
Share Repurchase Program, Additional Increase, Amount
Balance, shares
Balance, shares
Common Stock, Shares, Outstanding
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Award Timing Disclosures [Line Items]
Foreign Currency Translation Adjustments
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Diluted (in dollars per share)
Earnings Per Share, Diluted
Entity Current Reporting Status
Entity Current Reporting Status
Net cash used in financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Total Shareholder Return Amount
Total Shareholder Return Amount
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
Litigation Case [Domain]
Litigation Case [Domain]
Amortization of intangible assets
Amortization expense
Intangible Asset, Finite-Lived, Amortization Expense
Ownership [Domain]
Ownership [Domain]
Changing Discount Rate
Changing Discount Rate [Member]
Changing Discount Rate
2029
Long-Term Debt, Maturity, Year Three
Deferred compensation liabilities
Deferred Compensation Liability, Classified, Noncurrent
Cash flows from financing activities:
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Property, plant and equipment, net
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization
Net revenues
Total net revenues
Revenue from Contract with Customer, Excluding Assessed Tax
Intangible Asset, Finite-Lived, Class [Axis]
Intangible Asset, Finite-Lived, Class [Axis]
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Underlying Securities
Award Underlying Securities Amount
Less: Comprehensive income attributable to noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
REVENUE RECOGITION
Revenue from Contract with Customer [Text Block]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Subsegments [Domain]
Subsegments [Domain]
Subsegments [Axis]
Subsegments [Axis]
Other investing activities, net
Payment for (Proceeds from) Other Investing Activity
4.60% Senior Notes due December 2027
Four Point Six Zero Percent Senior Notes Due December 2027 [Member]
Four Point Six Zero Percent Senior Notes Due December 2027
Segment Reporting [Table]
Segment Reporting [Table]
Schedule of Maturities of Long-term Debt
Schedule of Maturities of Long-Term Debt [Table Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
All Trading Arrangements
All Trading Arrangements [Member]
Derivatives designated as hedging instruments
Derivative, Gain (Loss) on Derivative, Net
Liability
Balance, December 31, 2025
Balance, June 30, 2026
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Other Performance Measure, Amount
Other Performance Measure, Amount
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Operating income
Segment operating income
Operating Income (Loss)
Current Fiscal Year End Date
Current Fiscal Year End Date
Proceeds from borrowings
Proceeds from Issuance of Debt
5.00% Senior Notes due December 2034
Five Point Zero Zero Percent Senior Notes Due December 2034 [Member]
Five Point Zero Zero Percent Senior Notes Due December 2034
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
Derivative [Line Items]
Derivative [Line Items]
BUSINESS ACQUISITIONS
Business Combination [Text Block]
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]
Dividends per common share
Common Stock, Dividends, Per Share, Declared
Entity File Number
Entity File Number
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Issuance of common stock under benefit plans
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Distributions to noncontrolling interest partners
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Asset impairment charges
Asset, Impairment Loss
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Measure:
Measure [Axis]
Government payers (principally fee-for-service)
Government Payers [Member]
Government Payers [Member]
Treasury stock (in shares)
Treasury Stock, Common, Shares
Equity Components [Axis]
Equity Components [Axis]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Product and Service [Domain]
Product and Service [Domain]
Triggering Event [Axis]
Triggering Event [Axis]
Triggering Event
Fixed-to-variable interest rate swaps
Interest Rate Fair Value Hedge Asset at Fair Value
Entity Interactive Data Current
Entity Interactive Data Current
Less: Net income attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities, Current
Entity Small Business
Entity Small Business
Comprehensive income attributable to Quest Diagnostics
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Discount
Unamortized discount
Debt Instrument, Unamortized Discount
Termination Date
Trading Arrangement Termination Date
Senior Unsecured Revolving Credit Facility
Senior unsecured revolving credit facility [Member]
Senior unsecured revolving credit facility [Member]
Schedule of Debt Instrument Fair Value Basis Adjustment Attributable to Hedged Debt
Schedule of Debt Instrument Fair Value Basis Adjustment Attributable to Hedged Debt [Table Text Block]
Schedule of Debt Instrument Fair Value Basis Adjustment Attributable to Hedged Debt [Table Text Block]
Intangible assets
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Interest expense, net
Interest Income (Expense), Operating
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Fixed-to-variable interest rate swap agreements
Derivative Asset, Subject to Master Netting Arrangement, after Offset
Other assets
Other Assets, Noncurrent
Document Type
Document Type
Business acquisitions, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Fair Value as of Grant Date
Award Grant Date Fair Value
Triggering Event [Domain]
Triggering Event [Domain]
Triggering Event
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Share repurchase authorization remaining available
Share Repurchase Program, Remaining Authorized, Amount
Arrangement Duration
Trading Arrangement Duration
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Local Phone Number
Local Phone Number
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Entity Registrant Name
Entity Registrant Name
Healthcare Insurers
Healthcare Insurers [Member]
Healthcare Insurers [Member]
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Commitments and contingencies
Commitments and Contingencies
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Equity in earnings of equity method investees, net of taxes
Income (Loss) from Equity Method Investments
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Executive Category:
Executive Category [Axis]
Liabilities and Stockholders’ Equity
Liabilities and Equity [Abstract]
Intangible Asset, Finite-Lived, Class [Domain]
Intangible Asset, Finite-Lived, Class [Domain]
Inventories
Inventory, Net
All Award Types
Award Type [Domain]
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
FAIR VALUE MEASUREMENTS
Fair Value Disclosures [Text Block]
Significant Unobservable Inputs, Level 3
Fair Value, Inputs, Level 3
Fair Value, Inputs, Level 3 [Member]
4.625% Senior Notes due December 2029
Four Point Six Two Five Percent Senior Notes Due December 2029 [Member]
Four Point Six Two Five Percent Senior Notes Due December 2029
Purchases of treasury stock (in shares)
Purchases of treasury stock (in shares)
Treasury Stock, Shares, Acquired
Ownership percentage by noncontrolling owners
Subsidiary, Ownership Percentage, Noncontrolling Owner
PEO Name
PEO Name
Net Deferred Gains on Cash Flow Hedges, net of tax
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Income taxes paid
Income Tax Paid, before Refund Received
Less: Other segment items
Segment Reporting, Other Segment Item, Amount
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Table]
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Table]
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Table]
5.75% Senior Notes due January 2040
Five Point Seven Five Percent Senior Notes Due2040 [Member]
Five Point Seven Five Percent Senior Notes Due 2040 [Member]
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Entity Tax Identification Number
Entity Tax Identification Number
Measurement input
Business Combination, Contingent Consideration, Liability, Measurement Input
Legal Entity [Axis]
Legal Entity [Axis]
Carrying Amount of Hedged Long-Term Debt
Hedged Liability, Fair Value Hedge
Liability Class [Axis]
Liability Class [Axis]
Purchases of treasury stock
Purchases of treasury stock, value
Treasury Stock, Value, Acquired, Cost Method
Cash and cash equivalents and restricted cash, beginning of period
Cash and cash equivalents and restricted cash, end of period
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Total maturities of long-term debt
Long-term Debt, Maturities Gross
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and before deducting unamortized discount or premiums, if any.
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Non-NEOs
Non-NEOs [Member]
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]
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Debt Instrument [Axis]
Debt Instrument [Axis]
Cash paid for business acquisitions
Payments to Acquire Businesses, Gross
Stock-based compensation expense
Share-Based Payment Arrangement, Noncash Expense
Mike Prevoznik [Member]
Mike Prevoznik
2027
Long-Term Debt, Maturity, Year One
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Schedule of Derivative Instruments at Fair Value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Basic (in dollars per share)
Earnings Per Share, Basic
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Purchases of treasury stock
Payments for Repurchase of Common Stock
Total current assets
Assets, Current
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Insider Trading Arrangements [Line Items]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Total long-term debt, net of current portion
Long-Term Debt, Excluding Current Maturities
Cost of services
Cost of Revenue
Award Type
Award Type [Axis]
Hedge Accounting Basis Adjustment
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
Accounts receivable, net of allowance for credit losses of $28 and $25 as of June 30, 2026 and December 31, 2025, respectively
Accounts Receivable, after Allowance for Credit Loss, Current
Retained earnings
Retained Earnings (Accumulated Deficit)
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities [Abstract]
Product and Service [Axis]
Product and Service [Axis]
Increase in contingent consideration liability
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)
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]
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Common Stock
Common Stock [Member]
Contingent consideration
Business Combination, Contingent Consideration, Liability
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Cover [Abstract]
Cover [Abstract]
Fee-for-service
Fee-for-service [Member]
Fee-for-service [Member]
Target percent for annual productivity savings
Restructuring and Related Activities, Target Percent For Annual Productivity Savings
Restructuring and Related Activities, Target Percent For Annual Productivity Savings
Operating lease liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liabilities
Derivative Contract [Domain]
Derivative Contract [Domain]
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Fair Value
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Total liabilities and stockholders’ equity
Liabilities and Equity
6.40% Senior Notes due November 2033
6.40% Senior Notes due November 2033 [Member]
6.40% Senior Notes due November 2033
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Noncontrolling interests
Equity, Attributable to Noncontrolling Interest
Segments [Axis]
Segments [Axis]
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Schedule of Fair Value Hedge Accounting on the Statement of Operations
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Total restructuring charges
Restructuring Charges
Tabular List, Table
Tabular List [Table Text Block]
2.95% Senior Notes due June 2030
Two Point Nine Five Percent Senior Notes due June 2030 [Member]
Two Point Nine Five Percent Senior Notes due June 2030 [Member]
Other
Other Long-Term Debt
Other income, net
Other Nonoperating Income (Expense)
Other operating expense (income), net
Other Operating Income (Expense), Net
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Haystack Oncology, Inc.
Haystack Oncology, Inc. [Member]
Haystack Oncology, Inc.
Stockholders’ equity:
Equity, Including Portion Attributable to Noncontrolling Interest [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]
Self-insurance reserves
Malpractice Loss Contingency, Accrual, Undiscounted
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Additional Impact
Additional Impact [Member]
Additional Impact
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Class action lawsuits
Loss Contingency, Pending Claims, Number
Hedging Designation [Domain]
Hedging Designation [Domain]
Gary Pfeiffer [Member]
Gary Pfeiffer
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Interest paid
Interest Paid, Excluding Capitalized Interest, Operating Activity
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Extinguishment of debt
Extinguishment of Debt, Amount
Hedging Designation [Axis]
Hedging Designation [Axis]
RESTRUCTURING ACTIVITIES AND IMPAIRMENT CHARGES
Restructuring and Related Activities Disclosure [Text Block]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Total
Assets, Fair Value Disclosure
Long-term debt
Long-Term Debt and Lease Obligation
Name
Measure Name
Pay vs Performance Disclosure [Line Items]
All other operating segments
Other Operating Segment [Member]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Other, net
Other Noncash Income (Expense)
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Entity Filer Category
Entity Filer Category
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Elements [Abstract]
Name
Trading Arrangement, Individual Name
Cash and cash equivalents
Cash and Cash Equivalent
Company Selected Measure Amount
Company Selected Measure Amount
Depreciation and amortization
Depreciation and amortization expense
Depreciation, Depletion and Amortization
Issuance of common stock under benefit plans (in shares)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Net income
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
2031
Long-Term Debt, Maturity, Year Five
Non-PEO NEO
Non-PEO NEO [Member]
Senior Notes
Senior Notes [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Leased assets obtained in exchange for new operating lease liabilities
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Income tax expense
Income Tax Expense (Benefit)
Fair Value Hedging
Fair Value Hedging [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]
Award Timing Method
Award Timing Method [Text Block]
Net change in cash and cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Maximum contingent consideration payment
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount
Deferred income tax liabilities
Business Combination, Recognized Liability Assumed, Deferred Tax Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Contributions from noncontrolling interest partners
Noncontrolling Interest, Increase from Contributions
Noncontrolling Interest, Increase from Contributions
Net income attributable to Quest Diagnostics
Net income attributable to Quest Diagnostics
Net Income (Loss) Attributable to Parent
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
Debt issuance costs
Unamortized Debt Issuance Expense
Balance Sheet Location [Axis]
Location, Statement of Financial Position, Balance [Axis]
Statement [Table]
Statement [Table]
Restatement Determination Date:
Restatement Determination Date [Axis]
Exercise of stock options
Proceeds from Stock Options Exercised
3.45% Senior Note due June 2026
Three Point Four Five Percent Senior Notes Due June 2026 [Member]
Three Point Four Five Percent Senior Notes due June 2026 [Member]
Derivative rate
Derivative, Basis Spread on Variable Rate
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]