Amount per Share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Amortizable intangible assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Notional Amounts of Senior Notes Under Swap Agreements Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Prior years Prior Year Claims and Claims Adjustment Expense Award Timing Predetermined Award Timing Predetermined [Flag] Total other intangible assets, Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Asset Class [Axis] Asset Class [Axis] Entity File Number Entity File Number Capital In Excess of Par Value Additional Paid-in Capital [Member] Interest Rate Swap Interest Rate Swap [Member] Unrealized in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Equity in net losses Equity in net losses Income (Loss) from Equity Method Investments Total reclassification adjustment, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Schedule of Details of Dividend Payments Dividends Declared [Table Text Block] Accounting Pronouncements Effective in Future Periods New Accounting Pronouncements, Policy [Policy Text Block] Call Option Call Option [Member] Goodwill [Line Items] Goodwill [Line Items] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] $500 million, 3.950% due August 15, 2049 3.95 Percent Senior Notes Due August 2049 [Member] 3.95 Percent Senior Notes Due August 2049 [Member] Measurement Basis [Axis] Measurement Basis [Axis] Basic earnings per common 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] Commercial Paper Commercial paper Commercial Paper [Member] Weighted average cost of capital Measurement Input, Discount Rate [Member] Other Comprehensive (loss) Income Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Results Schedule of Segment Reporting Information, by Segment [Table Text Block] Commercial paper borrowings Commercial paper Short-term debt outstanding Short-Term Debt Schedule of Indefinite-Lived Intangible Assets [Table] Intangible Asset, Indefinite-Lived [Table] Measurement Input Type [Domain] Measurement Input Type [Domain] MaxHealth MaxHealth [Member] MaxHealth Schedule of Investment Securities Classified as Current and Long-Term Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Member co-share amounts and government subsidies Government And Health Plan Member Subsidies Amount Amount of member co-share amounts and government subsidies that are excluded from benefits expense because the health plans do not bear responsibility. Concentration risk (as percent) Concentration Risk, Percentage Other assets Increase (Decrease) in Other Operating Assets Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Indefinite-lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Employee stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Provider contracts Contractual Rights [Member] Dividends and dividend equivalents Dividends, Common Stock, Cash Total stockholders' equity Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Current assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Medicare licenses Licensing Agreements [Member] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Receipts (payments) from contract deposits, net Payments For (Proceeds From) Contract Deposits Payments For (Proceeds From) Contract Deposits Maximum Maximum [Member] Weighted Average Life (in years) Finite-Lived Intangible Asset, Useful Life $500 million, 5.750% due March 1, 2028 5.750 Percent Senior Notes Due March 2028 [Member] 5.750 Percent Senior Notes Due March 2028 Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Amortizable intangible assets, Net Finite-Lived Intangible Assets, Net Total Debt Securities, Available-for-Sale, Unrealized Loss Position Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted stock Restricted Stock [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Treasury Stock Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount $750 million, 2.150% due February 3, 2032 2.15 Percent Senior Notes Due February 2032 [Member] 2.15 Percent Senior Notes Due February 2032 Swap liability Interest Rate Fair Value Hedge Liability at Fair Value Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Fair value of financial liability Financial Liabilities Fair Value Disclosure Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Entity Shell Company Entity Shell Company $400 million, 4.625% due December 1, 2042 4.625 Percent Senior Notes Due December 2042 [Member] 4.625 Percent Senior Notes Due December 2042 [Member] Gross gains on investment securities Debt And Equity Securities, Realized Gain Debt And Equity Securities, Realized Gain Other long-term liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Total senior notes Long-Term Debt, Current Maturities 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 income attributable to Humana Comprehensive Income (Loss), Net of Tax, Attributable to Parent Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Measurement Input Type [Axis] Measurement Input Type [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Letter of Credit Letter of Credit [Member] Due within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Proceeds from maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Schedule of Gross Unrealized Losses and Fair Value by Investment Category Unrealized Gain (Loss) on Investments [Table Text Block] Award Type [Axis] Award Type [Axis] Changes in securities lending collateral receivable Increase (Decrease) in Collateral Held under Securities Lending Maximum amount outstanding during period Short-Term Debt, Maximum Amount Outstanding During Period Total assets Assets Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Call option strike price Strategic Partnership Agreement, Call Option Strike Price Strategic Partnership Agreement, Call Option Strike Price 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Max Health Acquisition Business Combination [Policy Text Block] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Interest Rate Swap Maturing 2047 Interest Rate Swap Maturing 2047 [Member] Interest Rate Swap Maturing 2047 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] Put Option Put Option [Member] Intangible assets, weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Total gains or losses: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] $500 million, 6.000% due May 1, 2055 6.000 Percent Senior Notes Due May 2055 [Member] 6.000 Percent Senior Notes Due May 2055 $850 million, 5.950% due March 15, 2034 5.950 Percent Senior Notes Due March 2034 [Member] 5.950 Percent Senior Notes Due March 2034 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company Cash dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] 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] Services Services revenue Revenue from Contract with Customer, Including Assessed Tax Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Securities, number of positions Debt, Securities, Available-For-Sale, Securities, Number Of Positions Debt Securities, Available-for-sale, Securities, Number Of Positions Depreciation and amortization classified as benefit expense Depreciation And Amortization Classified As Benefit Expense Depreciation and amortization expense that has been reclassified to be included with benefit expenses. The reclassification is the result of depreciation and amortization expense associated primarily from the delivery of pharmacy services by our wholly-owned pharmacy business included in our Healthcare Services segment. Equity method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Business Combination [Domain] Business Combination [Domain] Maximum debt to capitalization (as percent) Debt Instrument, Covenant, Debt To Capitalization Percentage, Maximum Debt Instrument, Covenant, Debt To Capitalization Percentage, Maximum Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Significant unobservable inputs Derivative Asset (Liability) Net, Measurement Input Insurance [Abstract] Insurance [Abstract] Interest Rate Swap Maturing 2053 Interest Rate Swap Maturing 2053 [Member] Interest Rate Swap Maturing 2053 PEO PEO [Member] Transfers in Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Schedule of Contractual Maturities of Debt Securities Available for Sale Investments Classified by Contractual Maturity Date [Table Text Block] Details of businesses acquired in purchase transactions: Noncash Investing and Financing Items [Abstract] Income before income taxes and equity in net losses Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Junior Subordinated Notes Junior Subordinated Debt [Member] Changes in operating assets and liabilities, net of effect of businesses acquired: 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] Nature of Operation, Product Information, Concentration of Risk [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Swap asset Interest Rate Fair Value Hedge Asset at Fair Value Schedule of Estimate of Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Retained Earnings Retained Earnings [Member] Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date 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, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) 12 months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Basis points spread on variable rate Debt Instrument, Basis Spread on Variable Rate Common shares acquired in connection with employee stock plans, amount Share Repurchases Related To Employee Stock Based Compensation Awards Value Cost of common stock that were repurchased in the administration of our employee share-based compensation plans. Under the terms of these plans, we accept shares of common stock from option holders if they elect to surrender previously-owned shares upon exercise of the option to cover the exercise price of the options or, in the case of restricted shares of common stock, the withholding of shares to satisfy tax withholding obligations associated with the vesting of such shares. Eliminations/ Corporate Corporate And Eliminations [Member] Corporate And Eliminations [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] 5-year unsecured revolving credit agreement May 2025 Revolving Credit Agreement May 2025 Five Year [Member] Revolving Credit Agreement May 2025 Five Year Total other intangible assets, Net Intangible Assets, Net (Excluding Goodwill) Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Incurred related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Investment income Net Investment Income Total Stockholders' Equity Parent [Member] Net income Net income Net income 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] Derivative, notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] External Revenues External Revenues [Member] External Revenues Non-cash securities lending, fair value Securities Received as Collateral Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Acquisitions Goodwill, Acquired During Period Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] City Area Code City Area Code ACQUISITIONS AND DIVESTITURES Mergers, Acquisitions and Dispositions Disclosures [Text Block] Acquisitions, net of cash acquired Cash paid for acquired businesses, net of cash acquired Acquisitions, 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] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Number of call center brokers for which non-commission payments were made Loss Contingency, Number Of Call Center Brokers For Which Non-Commission Payments Were Made Loss Contingency, Number Of Call Center Brokers For Which Non-Commission Payments Were Made Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] $600 million, 3.950% due March 15, 2027 3.95 Percent Senior Notes Due March 2027 [Member] 3.95 Percent Senior Notes Due March 2027 [Member] Actual debt to capitalization (as percent) Debt Instrument, Covenant, Debt To Capitalization Percentage, Actual Debt Instrument, Covenant, Debt To Capitalization Percentage, Actual Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] 364-day unsecured revolving credit agreement May 2024 Revolving Credit Agreement May 2024 One Year [Member] Revolving Credit Agreement May 2024 One Year Interest Rate Swap Maturing 2055 Interest Rate Swap Maturing 2055 [Member] Interest Rate Swap Maturing 2055 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 Cost Sharing Settlements Medicare Part D Cost Sharing Settlements Medicare Part D [Member] Risk Corridor Settlements - Medicare Part D [Member] Dispositions Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Debt instrument term (in years) Debt Instrument, Term Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-Sale Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Preferred stock, par (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Impairment of property and equipment Tangible Asset Impairment Charges 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Less: Fair value of liabilities assumed Liabilities Assumed $750 million, 3.700% due March 23, 2029 3.700 Percent Senior Notes Due March 2029 [Member] 3.700 Percent Senior Notes Due March 2029 Equity Components [Axis] Equity Components [Axis] Transfers out Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Restricted stock unit vesting Stock Issued During Period, Value, Restricted Stock Award, Gross Common shares acquired in connection with employee stock plans (in shares) Share Repurchases Related To Employee Stock Based Compensation Awards Shares Number of shares of common stock that were repurchased in the administration of our employee share-based compensation plans. Under the terms of these plans, we accept shares of common stock from option holders if they elect to surrender previously-owned shares upon exercise of the option to cover the exercise price of the options or, in the case of restricted shares of common stock, the withholding of shares to satisfy tax withholding obligations associated with the vesting of such shares. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Effect of income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Product Product [Member] Number of reportable segments Number of Reportable Segments Supplemental cash flow disclosures: Supplemental Cash Flow Information [Abstract] Amortized Cost Book value Debt Securities, Available-for-Sale, Amortized Cost Tax-exempt municipal securities Tax-exempt municipal securities Nontaxable Municipal Notes [Member] Benefits Benefits Policyholder Benefits and Claims Incurred, Net Other Performance Measure, Amount Other Performance Measure, Amount U.S. Treasury and agency obligations U.S. Treasury and agency obligations US Treasury and Government [Member] Debt issue costs Payments of Debt Issuance Costs Short-term debt Short-term debt Debt, Current Entity Address, State or Province Entity Address, State or Province Distribution to noncontrolling interest holders, net Noncontrolling Interest, Increase (Decrease) From Contributions Or Distributions From (To) Noncontrolling Interest Holders Noncontrolling Interest, Increase (Decrease) From Contributions Or Distributions From (To) Noncontrolling Interest Holders Total Amount Dividends Total current liabilities Liabilities, Current Net tangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets Acquired (Liabilities) Assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets Acquired (Liabilities) Assumed Benefits payable Increase (Decrease) in Health Care Insurance Liabilities Derivative Instrument [Axis] Derivative Instrument [Axis] Restricted stock unit vesting (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Services Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Other current assets Other Assets, Current Capital in excess of par value Additional Paid in Capital, Common Stock Net cash (used in) provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Amortization Amortization 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] $750 million, 5.875% due March 1, 2033 5.875 Percent Senior Notes Due March 2033 [Member] 5.875 Percent Senior Notes Due March 2033 BENEFITS PAYABLE Insurance Disclosure [Text Block] Interest payments Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Mortgage and asset-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Repayments of notes Repayments of notes Repayments of Long-Term Debt Effective income tax rate (as percent) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Carrying Value Reported Value Measurement [Member] Equity [Abstract] Equity [Abstract] Losses (gains) on investment securities, net Net recognized (losses) gains on investment securities Debt and Equity Securities, Gain (Loss) SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Book overdraft Book Overdraft Liability Book Overdraft Liability $1,000 million, 6.625% due September 15, 2056 6.625 Percent Junior Subordinated Notes Due September 2056 [Member] 6.625 Percent Junior Subordinated Notes Due September 2056 Schedule of Goodwill [Table] Goodwill [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] $500 million, 4.875% due April 1, 2030 4.875 Percent Senior Notes Due April 2030 [Member] A 4.875 Percent Senior Notes Due April 2030 [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Gross Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Acquired Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization Amortization of Intangible Assets Operating costs Operating costs Selling, General and Administrative Expense Other long-term assets Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total revenues Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Residential Residential Residential Mortgage-Backed Securities [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Unearned revenues Contract with Customer, Liability, Current 2023 Share Repurchase Authorization 2023 Share Repurchase Authorization [Member] 2023 Share Repurchase Authorization Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] 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] ASSETS Assets [Abstract] Long-term debt Total 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 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Debt Instrument [Axis] Debt Instrument [Axis] FAIR VALUE Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Amortizable intangible assets, Gross Carrying Amount Finite-Lived Intangible Assets, Gross Stockholders’ 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] Total operating expenses Benefits, Losses and Expenses Entity Address, Address Line One Entity Address, Address Line One Common stock repurchases Stock repurchases Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Stated interest rate (as percent) Stated interest rate (as percent) Debt Instrument, Interest Rate, Stated Percentage Receivables, net of allowances Accounts Receivable, Allowance for Credit Loss, Current Investment Securities, Available-for-sale Amortized Cost to Fair Value Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] eHealth Litigation eHealth Litigation [Member] eHealth Litigation Fair Value Risk Fair Value Risk [Member] Fair Value Risk Cms Subsidies Or Discounts Cms Subsidies Or Discounts [Member] CMS Subsidies Or Discounts [Member] Annualized volatility Measurement Input, Option Volatility [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] 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] Dilutive effect of employee stock options and restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Document Quarterly Report Document Quarterly Report Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Total invested assets Assets, fair value Assets, Fair Value Disclosure Securities in unrealized loss positions, number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Schedule of Assumptions Used For Inputs In Fair Value Measurement Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] $1,500 million, 5.375% due April 15, 2031 5.375 Percent Senior Notes Due April 2031 [Member] 5.375 Percent Senior Notes Due April 2031 Schedule of Carrying Value of Debt Outstanding Schedule of Debt [Table Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Services Service Service [Member] Schedule of Finite-Lived Intangible Assets Included in Other Long-Term Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Changes in rebate factor payable Increase (Decrease) In Rebate Factor Payable Increase (Decrease) In Rebate Factor Payable Non-PEO NEO Non-PEO NEO [Member] Other Proceeds from (Payment for) Other Financing Activity Interest Rate Swap Maturing 2038 Interest Rate Swap Maturing 2038 [Member] Interest Rate Swap Maturing 2038 S&P A+ rating Standard & Poor's, A+ Rating [Member] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Aggregate principal Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt instrument, payment deferral term Debt Instrument, Payment Deferral Term Debt Instrument, Payment Deferral Term Schedule of Activity in Benefits Payable Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Changes in securities lending payable Increase (Decrease) in Securities Lending Payable MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Percentage of debt securities considered to be of investment-grade (as percent) Percentage Of Total Debt Securities, Investment Grade Quality Percentage Of Total Debt Securities, Investment Grade Quality Reclassification adjustment for net realized (losses) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Revenues: Revenues [Abstract] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Effect of income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Maturities Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Maturities Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Maturities Fair value of financial asset Financial Assets, Fair Value Disclosure Financial Assets, Fair Value Disclosure Total premiums and services revenue (as percent) Percentage Of Total Premium And Services Revenues Percentage Of Total Premium And Services Revenues Financial Instruments [Domain] Financial Instruments [Domain] Litigation Case [Axis] Litigation Case [Axis] Segments [Domain] Segments [Domain] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Schedule of Indefinite-Lived Intangible Assets Included in Other Long-Term Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Maximum individual state general bond obligation as a percentage of total debt securities (as percent) Maximum Individual State General Bond Obligation, As Percentage Of Total Debt Securities Maximum Individual State General Bond Obligation, As Percentage Of Total Debt Securities Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity INVESTMENT SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Interest Rate Swap Maturing 2033 Interest Rate Swap Maturing 2033 [Member] Interest Rate Swap Maturing 2033 Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Line of credit, outstanding borrowings Line of Credit, Current Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Revenue Recognition Revenue [Policy Text Block] Senior Notes Senior Notes [Member] Purchases of investment securities Payments to Acquire Debt Securities, Available-for-Sale Options Option on Securities [Member] DEBT Debt Disclosure [Text Block] Preferred stock, $1 par; 10,000,000 shares authorized; none issued Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Current year Current Year Claims and Claims Adjustment Expense Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,719,832 shares issued at March 31, 2026 and 198,719,321 shares issued at December 31, 2025 Common Stock, Value, Issued Long term growth rate Measurement Input, Long-Term Revenue Growth Rate [Member] Goodwill [Roll Forward] Goodwill [Roll Forward] Restructuring Plan [Domain] Restructuring Plan [Domain] Premiums Premiums revenue Premiums Earned, Net Investment securities Short-Term Investments Estimate of Amortization Expense Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] COMMITMENTS, GUARANTEES AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Shares used to compute diluted earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Short-term debt, weighted average interest rate, at point in time Short-Term Debt, Weighted Average Interest Rate, at Point in Time $750 million, 5.500% due March 15, 2053 5.50 Percent Senior Notes Due March 2053 [Member] 5.50 Percent Senior Notes Due March 2053 Commitments and Contingencies (Note 13) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Interest Rate Swap Maturing 2054 Interest Rate Swap Maturing 2054 [Member] Interest Rate Swap Maturing 2054 Other intangible asset acquired Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Business Combination [Axis] Business Combination [Axis] Loans Payable Loans Payable [Member] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Interest Rate Swap Maturing 2031 Interest Rate Swap Maturing 2031 [Member] Interest Rate Swap Maturing 2031 Noncontrolling Interests Noncontrolling Interest [Member] Document Transition Report Document Transition Report Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Accounting Standards Update and Change in Accounting Principle [Text Block] Benefits payable including IBNR Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Proceeds (repayments) from issuance of commercial paper, net Proceeds from (Repayments of) Commercial Paper Underlying Securities Award Underlying Securities Amount Short-term Debt [Line Items] Short-Term Debt [Line Items] Equity Component [Domain] Equity Component [Domain] Cumulative, aggregate decrease to the carrying value of senior note Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Document Period End Date Document Period End Date 2024 Share Repurchase Authorization 2024 Share Repurchase Authorization [Member] 2024 Share Repurchase Authorization PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 INCOME TAXES Income Tax Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] MEDICARE PART D Medicare Part D Disclosure [Text Block] Balance sheet amounts associated with Medicare Part D. Debt outstanding Debt Instrument, Fair Value Disclosure Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Stock repurchase average price (in dollars per share) Shares Acquired, Average Cost Per Share Document Type Document Type Unobservable Inputs (Level 3) Level 3 Fair Value Measurement Fair Value, Inputs, Level 3 [Member] EARNINGS PER COMMON SHARE COMPUTATION 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 [Domain] Derivative Contract [Domain] Change in book overdraft Increase (Decrease) in Book Overdrafts All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Receivables Increase (Decrease) in Receivables Purchases of property and equipment, net Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Interest Rate Swap Maturing 2049 Interest Rate Swap Maturing 2049 [Member] Interest Rate Swap Maturing 2049 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Share repurchase authorization Share Repurchase Program, Authorized, Amount Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Fair value of collateral Securities lending invested collateral Securities Loaned, Fair Value of Collateral Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Maximum borrowing capacity including uncommitted incremental loan facility Line Of Credit Facility, Maximum Borrowing Capacity Including Uncommitted Incremental Capacity Maximum borrowing capacity under the credit facility including uncommitted incremental capacity and without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] $400 million, 4.800% due March 15, 2047 4.80 Percent Senior Notes Due March 2047 [Member] 4.80 Percent Senior Notes Due March 2047 [Member] Noncompetes and other Noncompetes And Other [Member] Noncompetes and Other [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Quoted Prices in Active Markets (Level 1) Fair Value, Inputs, Level 1 [Member] Insurance Insurance Insurance Segment [Member] Insurance Segment Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Gains (Losses) Related to Investment Securities Included Within Investment Income Schedule of Realized Gain (Loss) [Table Text Block] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Reinsurance Reinsurance Accounting Policy [Policy Text Block] Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Earnings Per Share [Abstract] Earnings Per Share [Abstract] Paid related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Restructuring Plan [Axis] Restructuring Plan [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Option Indexed to Issuer's Equity [Axis] Option Indexed to Issuer's Equity [Axis] Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Medicare Medicare [Member] Medicare [Member] Gentiva Hospice Gentiva Hospice [Member] Gentiva Hospice Unearned revenues Increase (Decrease) in Contract with Customer, Liability Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] $250 million, 8.150% due June 15, 2038 8.15 Percent Senior Notes Due June 2038 [Member] 8.15 Percent Senior Notes Due June 2038 [Member] Income tax refunds received, net of payments Income Taxes Paid, Net Stock repurchases (in shares) Treasury Stock, Shares, Acquired Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Uncommitted incremental loan facility Line Of Credit Facility, Uncommitted Incremental Capacity Line Of Credit Facility, Uncommitted Incremental Capacity 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Collaborative Arrangement and Arrangement Other than Collaborative [Table] Collaborative Arrangement and Arrangement Other than Collaborative [Table] Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract] Award Timing Disclosures [Line Items] Federal Home Loan Bank Advances Federal Home Loan Bank Advances [Member] Credit spread Credit Spread Option [Member] Total change in unrealized investment (losses) gains, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Interest Rate Swap Maturing 2035 Interest Rate Swap Maturing 2035 [Member] Interest Rate Swap Maturing 2035 STOCKHOLDERS' EQUITY Equity [Text Block] Trade names and technology Trade Names [Member] Net income attributable to Humana Net income attributable to Humana Net income available for common stockholders Net Income (Loss) Attributable to Parent Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Value Creation Initiatives Value Creation Initiatives [Member] Value Creation Initiatives Other liabilities Increase (Decrease) in Other Operating Liabilities 2031 Finite-Lived Intangible Asset, Expected Amortization, Year Five Product Information [Line Items] Product Information [Line Items] Property and equipment, net Property, Plant and Equipment, Net Investments Investments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Common stock repurchases Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status $500 million, 5.750% due December 1, 2028 5.750 Percent Senior Notes Due December 2028 [Member] 5.750 Percent Senior Notes Due December 2028 Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Revenue from External Customers by Products and Services [Table] Segment Reporting, Revenue from External Customer, Product and Service [Table] Income from operations Operating Income (Loss) Due within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Retained earnings Retained Earnings (Accumulated Deficit) Financial Instrument [Axis] Financial Instrument [Axis] 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] 12 months or more Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Impairment of indefinite-lived intangible assets Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Proceeds from issuance of notes, net Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Other intangible assets: Finite-Lived Intangible Assets, Net [Abstract] 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] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Statement [Table] Statement [Table] Other (income) expense, net Other Nonoperating Income (Expense) 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 [Abstract] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] 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] Gross losses on investment securities Debt And Equity Securities, Realized Loss Debt And Equity Securities, Realized Loss $750 million, 4.950% due October 1, 2044 4.95 Percent Senior Notes Due October 2044 [Member] 4.95 Percent Senior Notes Due October 2044 [Member] Receivables, net of allowances of $102 in 2026 and $108 in 2025 Receivables, Net, Current Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss BASIS OF PRESENTATION AND SIGNIFICANT EVENTS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Number of antidilutive stock options and restricted stock excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Interest Rate Swap Maturing 2044 Interest Rate Swap Maturing 2044 [Member] Interest Rate Swap Maturing 2044 Schedule of Changes in Fair Value of Assets Measured using Significant Unobservable Inputs (Level 3) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Interest Rate Swap Maturing 2034 Interest Rate Swap Maturing 2034 [Member] Interest Rate Swap Maturing 2034 All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Trade accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Amendment Flag Amendment Flag Fair value of assets acquired, net of cash acquired Fair Value of Assets Acquired Benefits payable Balances, beginning of period Balances, end of period Liability for Claims and Claims Adjustment Expense Treasury stock, at cost, 78,658,332 shares at March 31, 2026 and 78,128,009 shares at December 31, 2025 Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Certificates of need Certificate Of Need [Member] Certificate Of Need Long-term investment securities Debt Securities, Available-for-Sale, Noncurrent $500 million, 3.125% due August 15, 2029 3.125 Percent Senior Notes Due August 2029 [Member] A 3.125 Percent Senior Notes Due August 2029 [Member] Weighted average outstanding shares of common stock used to compute basic earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Financial Assets Measured at Fair Value on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount Net assets Net Asset (Liability) Net Asset (Liability) Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Computation of Basic and Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] 5-year unsecured revolving credit agreement June 2023 Revolving Credit Agreement June 2023 Five Year [Member] Revolving Credit Agreement June 2023 Five Year Segment Reporting [Abstract] Segment Reporting [Abstract] 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 $750 million, 5.550% due May 1, 2035 5.550 Percent Senior Notes Due May 2035 [Member] 5.550 Percent Senior Notes Due May 2035 CenterWell CenterWell CenterWell Segment [Member] CenterWell Segment Entity Tax Identification Number Entity Tax Identification Number Mortgage and asset-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Change in gross unrealized investment (losses) gains OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued $750 million, 1.350% due February 3, 2027 1.35 Percent Senior Notes Due February 2027 [Member] 1.35 Percent Senior Notes Due February 2027 Commercial Commercial Commercial Mortgage-Backed Securities [Member] GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Medicaid Medicaid [Member] Medicaid [Member] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Minimum collateral as percentage of fair value of investment securities Securities Loaned, Minimum Collateral As Percentage Of Fair Value Of Investment Securities Securities Loaned, Minimum Collateral As Percentage Of Fair Value Of Investment Securities Mortgage-backed securities Mortgage-backed securities Mortgage-backed securities: Commercial Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Dividends paid Payments of Dividends Schedule of Changes in Carrying Amount of Goodwill By Reportable Segments Schedule of Goodwill [Table Text Block] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Revenue exit multiple Revenue Exit Multiple [Member] Revenue Exit Multiple Welsh Carson Anderson And Stowe Welsh Carson Anderson And Stowe [Member] Welsh Carson Anderson And Stowe Loss Contingencies [Line Items] Loss Contingencies [Line Items] Restructuring and impairment charges Restructuring Costs and Asset Impairment Charges Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Investment income Investment Income, Interest and Dividend Total liabilities Liabilities Facility fee Line of Credit Facility, Commitment Fee Percentage $1,000 million, 5.750% due April 15, 2054 5.750 Percent Senior Notes Due April 2054 [Member] 5.750 Percent Senior Notes Due April 2054 Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Debt instrument, repurchased face amount Debt Instrument, Repurchased Face Amount Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Realized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Asset-backed securities Asset-backed securities Asset-backed securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Counterparty Name [Axis] Counterparty Name [Axis] Fair Value Debt Securities, Available-for-Sale, Unrealized Gain (Loss) [Abstract] Common Stock Common Stock [Member] Fair Value Fair value Fair Value Total debt securities Debt Securities, Available-for-Sale Customer contracts/relationships Customer Contracts [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt securities Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] 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 Interest Rate Swap Maturing 2042 Interest Rate Swap Maturing 2042 [Member] Interest Rate Swap Maturing 2042 Health Care [Member]