$600 million, 3.150% due December 1, 2022 3.15 Percent Senior Notes Due December 2022 [Member] 3.15 Percent Senior Notes Due December 2022 [Member] 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 Share repurchase authorization Stock Repurchase Program, Authorized Amount Supplemental cash flow disclosures: Supplemental Cash Flow Information [Abstract] Customer [Domain] Customer [Domain] Letter of credit Letter of Credit [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income attributable to Humana Net Income (Loss) Attributable to Parent Amortizable intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Dividends and dividend equivalents Dividends, Common Stock, Cash Security Exchange Name Security Exchange Name Common stock Equity Securities, FV-NI, Current Consideration to be received Disposal Group, Including Discontinued Operation, Consideration Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Term loan, due October 29, 2023 Term Loan Due October 2023 [Member] Term Loan Due October 2023 Capital in excess of par value Additional Paid in Capital, Common Stock Medicare stand-alone PDP Medicare Stand Alone Prescription Drug Plan [Member] Medicare Stand Alone Prescription Drug Plan [Member] COMMITMENTS, GUARANTEES AND CONTINGENCIES Commitments Contingencies and Guarantees [Text Block] Other long-term assets Other Assets, Noncurrent Segments [Axis] Segments [Axis] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Entity File Number Entity File Number Redemption price, percentage Debt Instrument, Redemption Price, Percentage Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition $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 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. Specialty Specialty [Member] Specialty [Member] Dividends Dividends, Common Stock [Abstract] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amortization expense for other intangible assets Amortization of Intangible Assets Less: noncontrolling interests Income (Loss) From Continuing Operations Before Income Taxes, Attributable To Noncontrolling Interest Income (Loss) From Continuing Operations Before Income Taxes, Attributable To Noncontrolling Interest Remaining authorized amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Proceeds from issuance of senior notes, net Proceeds from Issuance of Senior Long-term Debt Number of antidilutive stock options and restricted stock excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Put option Put Option [Member] $1.5 billion, 0.650% due August 3, 2023 0.65 Percent Senior Notes Due August 2023 [Member] 0.65 Percent Senior Notes Due August 2023 Business Combination and Asset Acquisition [Abstract] Facility fee (percent) Line of Credit Facility, Commitment Fee Percentage Business Acquisition [Axis] Business Acquisition [Axis] Proceeds from maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Total change in unrealized investment (losses) gains, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Disposal Group Name [Axis] Disposal Group Name [Axis] Realized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Schedule of Other Intangible Assets, Indefinite-Lived Schedule of Indefinite-Lived Intangible Assets [Table Text Block] $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] Award Type [Domain] Award Type [Domain] Receipts from contract deposits, net Payments For Proceeds From Contract Deposits Payments For Proceeds From Contract Deposits Local Phone Number Local Phone Number Credit Facility [Domain] Credit Facility [Domain] Accelerated Share Repurchases, Date [Domain] Accelerated Share Repurchases, Date [Domain] ASSETS Assets [Abstract] Schedule of Investment Securities Classified as Current and Long-Term Schedule of Available-for-sale Securities Reconciliation [Table Text Block] $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] Schedule of Contractual Maturity of Debt Securities Available for Sale Investments Classified by Contractual Maturity Date [Table Text Block] Comprehensive (loss) income attributable to equity method investments Comprehensive Income (Loss), Net Of Tax, Attributable To Equity Method Investments Comprehensive Income (Loss), Net Of Tax, Attributable To Equity Method Investments FHLB borrowings Federal Home Loan Bank Advances [Member] $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] Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income Schedule of Realized Gain (Loss) [Table Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Concentration risk, less than (percent) Concentration risk (percent) Concentration Risk, Percentage Preferred stock, $1 par; 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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. Gain (Loss) on Equity Securities Gain (Loss) on Securities [Table Text Block] Debt to capitalization percentage, maximum Debt Instrument, Covenant, Debt To Capitalization Percentage, Maximum Debt Instrument, Covenant, Debt To Capitalization Percentage, Maximum Total invested assets Assets, Fair Value Disclosure Quoted Prices in Active Markets (Level 1) Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Other Other Operating Activities, Cash Flow Statement January 2022 ASR January 2022 Accelerated Share Repurchase Agreement [Member] January 2022 Accelerated Share Repurchase Agreement Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Total liabilities and stockholders’ equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Unearned revenues Contract with Customer, Liability, Current Services Service [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] 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. Trade accounts payable and accrued expenses Trade accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Eliminations/ Corporate Corporate And Eliminations [Member] Corporate And Eliminations [Member] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] EARNINGS PER COMMON SHARE COMPUTATION Earnings Per Share [Text Block] Common stock repurchases Increase in treasury stock from stock repurchases Treasury Stock, Value, Acquired, Cost Method Operating expenses: Operating Expenses [Abstract] Net losses recognized on equity securities during the period Equity Securities, FV-NI, Gain (Loss) Entity Interactive Data Current Entity Interactive Data Current Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] 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] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Stock option exercises Stock Issued During Period, Value, Stock Options Exercised Minimum Minimum [Member] BASIS OF PRESENTATION AND SIGNIFICANT EVENTS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Income before income taxes and equity in net earnings Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Operating costs Selling, General and Administrative Expense Proceeds from term loan Proceeds from Notes Payable Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Enterprise value of acquiree including existing equity value Business Combination, Total Enterprise Value Of Acquiree Business Combination, Total Enterprise Value Of Acquiree Entity Address, State or Province Entity Address, State or Province Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Tricare East Region Contract Tricare East Region Contract [Member] Tricare East Region Contract [Member] BENEFITS PAYABLE Insurance Disclosure [Text Block] $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] 12 months or more Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Actual debt to capitalization percentage Debt Instrument, Covenant, Debt To Capitalization Percentage, Actual Debt Instrument, Covenant, Debt To Capitalization Percentage, Actual $600 million, 4.500% due April 1, 2025 4.50 Percent Senior Notes Due April 2025 [Member] A 4.50 Percent Senior Notes Due April 2025 [Member] Current liabilities: Liabilities, Current [Abstract] Revenue Recognition Revenue [Policy Text Block] Benefits payable Increase (Decrease) in Health Care Insurance Liabilities Acquisitions, net of cash and cash equivalents acquired Cash paid for acquired businesses, net of cash and cash equivalents acquired Payments to Acquire Businesses, Net of Cash Acquired DEBT Debt Disclosure [Text Block] Restricted stock unit vesting Stock Issued During Period, Value, Restricted Stock Award, Gross Senior notes Senior Notes [Member] Number of states comprising TRICARE beneficiaries Number Of States Comprising TRICARE Beneficiaries Number Of States Comprising TRICARE Beneficiaries Unobservable Inputs (Level 3) Level 3 fair value measurement Fair Value, Inputs, Level 3 [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Number of reportable segments Number of Reportable Segments 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. 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Class of Treasury Stock [Table] Receivables, allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Mortgage and asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Restricted stock Restricted Stock [Member] Debt issue costs Payments of Debt Issuance Costs Product Concentration Risk Product Concentration Risk [Member] INVESTMENT SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Cover [Abstract] Cover [Abstract] Dilutive effect of employee stock options and restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Goodwill [Line Items] Goodwill [Line Items] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Treasury stock, shares (in shares) Treasury Stock, Shares 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Stock Treasury Stock [Member] Purchases of investment securities Payments to Acquire Debt Securities, Available-for-sale Net recognized (losses) gains on investment securities Debt and Equity Securities, Gain (Loss) Other (income) expense, net Other Nonoperating Income (Expense) Other liabilities Increase (Decrease) in Other Operating Liabilities Purchases of property and equipment, net Payments to Acquire Property, Plant, and Equipment Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Maximum Maximum [Member] Effect of income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Total liabilities Liabilities Other intangible assets: Intangible Assets, Net (Excluding Goodwill) [Abstract] Receivables Increase (Decrease) in Receivables Award Type [Axis] Award Type [Axis] 2023 Finite-Lived Intangible Asset, Expected 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$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 Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Aggregate principal Debt Instrument, Face Amount Interest expense Interest Expense Weighted average annual interest rate (percent) Short-term Debt, Weighted Average Interest Rate, at Point in Time Medicare licenses Licensing Agreements [Member] Retained earnings Retained Earnings (Accumulated Deficit) Services revenue, type Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Individual Medicare Advantage Medicare Advantage [Member] Medicare Advantage [Member] Operating segments Operating Segments [Member] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category 364-day unsecured revolving credit agreement Revolving Credit Agreement June 2021 One Year [Member] Revolving Credit Agreement June 2021 One Year Business Acquisition [Line Items] Business Acquisition [Line Items] Income Statement [Abstract] Income Statement [Abstract] Equity method investments Equity Method Investments Concentration Risk [Table] Concentration Risk [Table] Reclassification from capital in excess of par value to treasury stock Common Stock Reclassified From Capital In Excess Of Par Value To Treasury Stock Upon Repurchase, Value Common Stock Reclassified From Capital In Excess Of Par Value To Treasury 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Available-for-sale Counterparty Name [Domain] Counterparty Name [Domain] Total other intangible assets, cost Intangible Assets, Gross (Excluding Goodwill) Home solutions Home Solutions [Member] Home Solutions Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment earnings (loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Long term growth rate Measurement Input, Long-term Revenue Growth Rate [Member] Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total operating expenses Benefits, Losses and Expenses Total Debt Securities, Available-for-sale, Unrealized Loss Position Segment Reporting [Abstract] Segment Reporting [Abstract] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Acquisitions Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions Weighted average life (in years) Finite-Lived Intangible Asset, Useful Life Customer [Axis] Customer [Axis] Outstanding borrowings Line of Credit, Current Schedule of Details Supporting Computation of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent October 2021 Term Loan Agreement October 2021 Term Loan Agreement [Member] October 2021 Term Loan Agreement Title of 12(b) Security Title of 12(b) Security Total assets Assets Mortgage and asset-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Common stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of Balance Sheet Amounts Associated With Medicare Part D Balance Sheet Account Associated With Medicare Part D Table [Table Text Block] Balance Sheet Account Associated With Medicare Part D Interest payments Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Repayment of term loan Repayments of Notes Payable Document Type Document Type Gross losses on equity securities Equity Securities, FV-NI, Realized Loss Product and Service [Domain] Product and Service [Domain] Noncontrolling Interests Noncontrolling Interest [Member] Gentiva Term Loan Due 2025 Gentiva Term Loan Due 2025 [Member] Gentiva Term Loan Due 2025 Schedule of Activity in Benefits Payable Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] MEDICARE PART D Medicare Part D Disclosure [Text Block] Balance sheet amounts associated with Medicare Part D. Stated interest rate (percent) Debt Instrument, Interest Rate, Stated Percentage Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Premiums Premiums Earned, Net Reclassification adjustment for net realized gains Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Revolving credit facility Revolving Credit Facility [Member] Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Short-term debt Short-term debt outstanding Short-term Debt Measurement Frequency [Axis] Measurement Frequency [Axis] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Receivables and Other [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Total reclassification adjustment, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Schedule of Carrying Value of Debt Outstanding Schedule of Debt [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Geographical [Axis] Geographical [Axis] Fully-insured Fully Insured [Member] Fully Insured [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 Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Gross gains on investment securities Debt Securities, Realized Gain, Gross Debt Securities, Realized Gain, Gross Products Product [Member] Fair value of financial liability Financial Liabilities Fair Value Disclosure Gross gains on equity securities Equity Securities, FV-NI, Realized Gain Income tax payments, net Income Taxes Paid, Net ACQUISITIONS Mergers, Acquisitions and Dispositions Disclosures [Text Block] Segment earnings (loss) attributable to Humana Income (Loss) From Continuing Operations Before Income Taxes, Attributable To Parent Income (Loss) From Continuing Operations Before Income Taxes, Attributable To Parent Total other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Comprehensive income attributable to Humana Comprehensive Income (Loss), Net of Tax, Attributable to Parent Enterprise valuation Disposal Group, Including Discontinued Operation, Enterprise Valuation Disposal Group, Including Discontinued Operation, Enterprise Valuation 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. Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury stock, at cost, 72,155,340 shares at March 31, 2022 and 69,846,758 shares at December 31, 2021 Treasury Stock, Value Number of TRICARE beneficiaries Number Of TRICARE Beneficiaries Number Of TRICARE Beneficiaries Term loan Loans Payable [Member] $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] Other long-term liabilities Other Noncurrent Liabilities [Member] Equity in net (losses) earnings Equity in net losses (earnings) Income (Loss) from Equity Method Investments Noncompetes and other Noncompetes And Other [Member] Noncompetes and Other [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] FAIR VALUE Fair Value Disclosures [Text Block] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Average daily volume weighted-average share price of common stock during term of agreement (in dollars per share) Accelerated Share Repurchases, Final Price Paid Per Share Fair Value Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Schedule of Financial Assets Measured at Fair Value on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Accumulated Other Comprehensive Income (loss) AOCI Attributable to Parent [Member] 2022 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Equity interest to be acquired per agreement (percent) Definitive Agreement, Equity Interest To Be Acquired, Percentage Definitive Agreement, Equity Interest To Be Acquired, Percentage Financial Instruments [Domain] Financial Instruments [Domain] 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 Revenues: Revenues [Abstract] Document Period End Date Document Period End Date Risk Corridor Settlement Risk Corridor Settlements Medicare Part D [Member] Risk Corridor Settlements - Medicare Part D [Member] Medicare Total Medicare Medicare [Member] Medicare [Member] Entity Central Index Key Entity Central Index Key Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Decrease in capital in excess of par value Treasury Stock, Decrease In Capital In Excess Of Par Value Treasury Stock, Decrease In Capital In Excess Of Par Value $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] Debt instrument term (in years) Debt Instrument, Term Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Details of businesses acquired in purchase transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Due within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Investment income Investment income (loss) Net Investment Income Uncommitted incremental loan facility Line Of Credit Facility, Uncommitted Incremental Capacity Line Of Credit Facility, Uncommitted Incremental Capacity Significant unobservable inputs Derivative Asset (Liability) Net, Measurement Input Loss Contingencies [Line Items] Loss Contingencies [Line Items] Property and equipment, net Property, Plant and Equipment, Net Other long-term liabilities Other long-term liabilities Other Liabilities, Noncurrent Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Residential Residential Mortgage Backed Securities [Member] (Repayments) proceeds from issuance of commercial paper, net Proceeds from (Repayments of) Commercial Paper Shares received (in shares) Treasury Stock, Shares, Acquired Schedule of Estimated Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Unrealized in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Trading Symbol Trading Symbol Earnings Per Share [Abstract] Earnings Per Share [Abstract] Benefits Policyholder Benefits and Claims Incurred, Net, Health Unrealized losses recognized on equity securities still held at the end of the period Equity Securities, FV-NI, Unrealized Gain (Loss) Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Other assets Increase (Decrease) in Other Operating Assets Total revenues Total revenues Revenues Line of Credit Facility [Table] Line of Credit Facility [Table] Proceeds from sales of investment securities Proceeds from Sale of Debt Securities, Available-for-sale Contract term years Contract Term Years Contract term, years. Securities in unrealized loss positions, number of positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Long-term debt Total long-term debt Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Entity Current Reporting Status Entity Current Reporting Status 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] Group Medicare Advantage Group Medicare Advantage [Member] Group Medicare Advantage Effective income tax rate (percent) Effective Income Tax Rate Reconciliation, Percent Total IBNR included in benefits payable Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Net income Net income attributable to Humana Net income available for common stockholders Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Wells Fargo Wells Fargo Bank [Member] Wells Fargo Bank Short-term debt Total short-term debt Debt, Current Accelerated stock repurchase payment Accelerated Share Repurchases, Settlement (Payment) or Receipt 5-year unsecured revolving credit agreement Revolving Credit Agreement June 2021 Five Year [Member] Revolving Credit Agreement June 2021 Five Year Counterparty Name [Axis] Counterparty Name [Axis] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Balances (in shares) Balances (in shares) Shares, Issued Depreciation and amortization Depreciation And Amortization Income Statement Depreciation and amortization expense excluding depreciation and amortization primarily from the delivery of pharmacy services by our wholly-owned pharmacy business (included in our Healthcare Services segment) which has been reclassified to benefit expenses. Total amount Dividends Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] Common stock, par (in dollars per share) Common Stock, Par or Stated Value Per Share Weighted average cost of capital Measurement Input, Discount Rate [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Other Proceeds from (Payments for) Other Financing Activities Estimated amortization remaining for the years ending December 31, Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Amortizable intangible assets, cost Finite-Lived Intangible Assets, Gross $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] Schedule of Other Intangible Assets, Amortizable Schedule of Finite-Lived Intangible Assets [Table Text Block] LIBOR London Interbank Offered Rate (LIBOR) [Member] Change in gross unrealized investment (losses) gains OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Option Indexed to Issuer's Equity [Axis] Option Indexed to Issuer's Equity [Axis] External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Benefits payable Balances, beginning of period Balances, end of period Liability for Claims and Claims Adjustment Expense Entity Address, Postal Zip Code Entity Address, Postal Zip Code Shares used to compute diluted earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Options Option on Securities [Member] Fair value Beginning balance at January 1 Balance at March 31 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Recurring Basis Fair Value, Recurring [Member] Amortization Amortization INCOME TAXES Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Fair value of assets acquired, net of cash and cash equivalents acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Basis spread on variable rate (percent) Debt Instrument, Basis Spread on Variable Rate STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Measurement Basis [Axis] Measurement Basis [Axis] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Total incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Certificates of need Certificate Of Need [Member] Certificate Of Need Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Total net asset (liability) Net Asset (Liability) Net Asset (Liability) Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Changes in operating assets and liabilities, net of effect of businesses acquired: Increase (Decrease) in Operating Capital [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Entity Shell Company Entity Shell Company Total current liabilities Liabilities, Current Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Loss Contingencies [Table] Loss Contingencies [Table] Services Services revenue Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Net current asset (liability) Net Current (Liability) Asset Net current (liability) asset Medicaid Medicaid [Member] Medicaid [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Asset-backed securities Asset-backed securities Asset-backed Securities [Member] Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Revenue exit multiple Revenue Exit Multiple [Member] Revenue Exit Multiple Statistical Measurement [Axis] Statistical Measurement [Axis] Accelerated stock repurchase agreement amount Accelerated Share Repurchases, Agreement Amount Accelerated Share Repurchases, Agreement Amount Subsequent event Subsequent Event [Member] Amortizable intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest 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] Schedule of Assumptions Used For Inputs In Fair Value Measurement Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Medicaid and other Medicaid And Other [Member] Medicaid and Other [Member] Schedule of Changes in Carrying Amount of Goodwill By Reportable Segments Schedule of Goodwill [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Due within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 12 months or more Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Remaining ownership percentage acquired Business Combination, Step Acquisition, Equity Interest in Acquiree, Subsequent Acquisition, Percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Subsequent Acquisition, Percentage Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Health Care [Member]