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Assets Acquired and Liabilities Assumed, Assets [Abstract] 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 Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Other Other Operating Income (Expense), Net Net income Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Total IBNP Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Employee purchase price as a percentage of stock price Fair Market Value Of Common Stock Percentage Fair market value of common stock, Percentage. Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Third-party escrow Escrow Deposit Entity File Number Entity File Number Reinsurance recoveries Insurance Recoveries Consolidated Entities [Domain] Consolidated Entities [Domain] Income Statement [Abstract] Condensed Statements of Income Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Provision for income taxes Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) Weighted-average number of shares issued: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Entity Address, Address Line Two Entity Address, Address Line Two 2019 EIP Equity Incentive Plan [Member] Equity Incentive Plan [Member] Name Forgone Recovery, Individual Name Operating leases, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Deferred income taxes Increase (Decrease) in Deferred Income Taxes Investments Investment, Policy [Policy Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Adjustment to Compensation: Adjustment to Compensation [Axis] 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 Accumulated other comprehensive loss Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Denominator for basic net income per share (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Less: effect of income taxes Less: effect of income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Name Awards Close in Time to MNPI Disclosures, Individual Name Acquired balances, net of post-acquisition adjustments Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions, Net Of Post-Closing Adjustments Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions, Net Of Post-Closing Adjustments Common stock withheld to settle employee tax obligations Common Stock Withheld to Settle Employee Tax Obligations Common Stock Withheld to Settle Employee Tax Obligations RSAs and PSUs (defined below) Restricted and Performance Stock [Member] Restricted and Performance Stock [Member] In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Entity Filer Category Entity Filer Category Acquisitions and measurement period adjustments Goodwill, Acquired During Period Statistical Measurement [Domain] Statistical Measurement [Domain] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Premium revenue percentage Health Care Organization, Revenue Percentage Health Care Organization, Revenue Percentage Schedule of Components of Lease Expense and Supplemental Consolidated Cash flow Information Lease, Cost [Table Text Block] Lease liabilities Operating Lease, Liabilities, Lessee [Abstract] Operating Lease, Liabilities, Lessee [Abstract] Impact on effective tax rate if tax benefits are recognized Unrecognized Tax Benefits that Would Impact Effective Tax Rate Incurred Claims and Allocated Claims Adjustment Expenses Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims Including Acquisition Adjustment Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims Including Acquisition Adjustment Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Schedule of Denominators for The Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Maximum award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Benefit Year 2022 Short-Duration Insurance Contract, Accident Year 2022 [Member] Tax credit carryovers Tax Credit Carryforward, Amount Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Income taxes, net Income Taxes Paid, Net Risk adjustment receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Receivable Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Receivable Amounts due government agencies Medical Premium Liability Due To Agency Medical Premium Liability Due to Agency Pay vs Performance Disclosure [Line Items] Medical claims and benefits payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Medical Claims and Benefits Payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Medical Claims and Benefits Payable Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Goodwill and intangible assets, net Goodwill and intangible assets, net Intangible Assets, Net (Including Goodwill) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] TEXAS TEXAS Net-of-Tax Amount Share-Based Payment Arrangement, Expense, after Tax Other Performance Measure, Amount Other Performance Measure, Amount Future amortization expense, 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Three Goodwill [Line Items] Goodwill [Line Items] Leases Lessee, Operating Leases [Text Block] Common stock, shares, outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Operating lease expense Operating Lease, Cost Other long-term liabilities (non-current) Operating Lease, Liability, Noncurrent Interest receivable Interest Receivable Interest on lease liabilities Finance Lease, Interest Expense Gross realized investment loss Debt Securities, Available-for-Sale, Realized Loss Deferred revenue Contract with Customer, Liability, Current Entity Tax Identification Number Entity Tax Identification Number Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Schedule of Long Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] 3.875% Notes due 2032 3.875% Senior Notes [Member] 3.875% Senior Notes Other Other Cost and Expense, Operating Structured Securities Structured Securities [Member] Structured Securities [Member] Plan Name [Axis] Plan Name [Axis] Thereafter Finance Lease, Liability, to be Paid, after Year Five Equity Components [Axis] Equity Components [Axis] Subtotal - undiscounted lease payments Finance Lease, Liability, to be Paid Trade names Trade Names [Member] Total operating expenses Costs and Expenses Business Health Medicare Business Acquisition, Acquiree [Domain] Receivable [Domain] Receivable [Domain] Geographical [Axis] Geographical [Axis] Net deferred income tax asset Deferred Tax Assets, Net 2029 Lessee, Operating Lease, Liability, to be Paid, Year Five Increased in deferred tax asset valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Receivables Receivables Receivables, Net, Current Common stock purchases Repurchased of common stock Stock Repurchased During Period, Value 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] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Segment expenses Segment Expenses Segment Expenses Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period Cash and cash equivalents, and restricted cash and cash equivalents at end of period Total cash and cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Premium Deficiency Reserves on Loss Contracts Premium Deficiency Reserves on Loss Contracts [Policy Text Block] Premium Deficiency Reserves on Loss Contracts Performance bond Special Assessment Bond Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Current assets: Assets, Current [Abstract] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Goodwill [Roll Forward] Goodwill [Roll Forward] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Prior period claims, favorable development Prior years Prior Year Claims and Claims Adjustment Expense Investments Marketable Securities, Current Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Security Exchange Name Security Exchange Name Unrealized investment income (loss) Unrealized investment income (loss) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax RSAs and PSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] State Current State and Local Tax Expense (Benefit) Number of members eligible for the health care programs Number Of Members Eligible For Government-Sponsored Healthcare Programs Number Of Members Eligible For Government-Sponsored Healthcare Programs Employee stock purchase plan Employee Stock Purchase Plan and Stock Options [Member] Employee Stock Purchase Plan and Stock Options [Member] Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Percent due to medicare, medical loss ratio of marketplace Percent Due To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace Percent Due To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace Income taxes Increase (Decrease) in Income Taxes Payable Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity WASHINGTON WASHINGTON Premium revenue Health Care, Premium [Member] Medical Medical [Member] Medical My Choice Wisconsin My Choice Wisconsin [Member] My Choice Wisconsin Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Total accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, shares authorized (in shares) Common Stock, Shares Authorized Government Receivables Government Receivables [Member] Government Receivables [Member] Net cash paid in business combinations Cash Payments to Acquire Businesses, Net of Cash Acquired Insurance [Abstract] Insurance [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Entity Voluntary Filers Entity Voluntary Filers Operating lease renewal term Lessee, Operating Lease, Renewal Term Interest expense Less: interest expense Interest Expense, Nonoperating Total deferred Deferred Income Tax Expense (Benefit) Operating leases: Lessee, Operating Lease, Description [Abstract] Health Plans Health Plans [Member] Health plans. Property, Equipment, and Capitalized Software, Net Property, Plant and Equipment Disclosure [Text Block] Contingent consideration liabilities settled Payment for Contingent Consideration Liability, Financing Activities Other comprehensive income (loss), net of tax Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total depreciation and amortization Depreciation and Amortization, Continuing Operations Depreciation and Amortization, Continuing Operations Due from affiliates Accounts Receivable, after Allowance for Credit Loss, Current In a Continuous Loss Position for 12 Months or More, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Impairment Asset Impairment Charges Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Change in amounts due to/from affiliates Changes In Amounts Due To And Due From Affiliates Changes in amounts due to and due from affiliates. Thereafter Long-Term Debt, Maturity, after Year Five Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Finance lease, remaining lease term Lessee, Finance Lease, Remaining Lease Term Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Common stock purchases (in dollars per share) Shares Acquired, Average Cost Per Share Investments in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Right-of-use assets Deferred Tax Liabilities, Operating Lease, Right-Of-Use Asset Deferred Tax Liabilities, Operating Lease, Right-Of-Use Asset Document Annual Report Document Annual Report 2027 Finance Lease, Liability, to be Paid, Year Three Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Deferred compensation plan Deferred Compensation Plan Assets ROU assets Finance Lease, Assets, Lessee [Abstract] Finance Lease, Assets, Lessee [Abstract] Schedule of Condensed Balance Sheets Condensed Balance Sheet [Table Text Block] Amortization of intangible assets Amortization of Intangible Assets Accounting Policies [Abstract] Accounting Policies [Abstract] Revenue: Revenue: Revenues [Abstract] Leasehold improvements Leasehold Improvements [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Stock purchases (in shares) Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Business Combinations Business Combination Disclosure [Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount PEO Name PEO Name Award Type [Domain] Award Type [Domain] Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Deferred income taxes, net Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Useful life Finite-Lived Intangible Asset, Useful Life Fair value of contingent consideration Contingent Consideration Classified as Equity, Fair Value Disclosure Additional Paid-in Capital Additional Paid-in Capital [Member] 4.375% Notes due 2028 4.375% Senior Notes [Member] 4.375% Senior Notes Finance lease liabilities Finance lease liabilities (non-current) Finance lease liabilities Finance Lease, Liability, Noncurrent Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Estimated Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization 2028 Finance Lease, Liability, to be Paid, Year Four Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Debt securities, sale Proceeds from Sale of Debt Securities, Available-for-Sale Impairment on property and equipment Tangible Asset Impairment Charges Other assets Operating Lease Right Of Use Asset, Excluding Leases Acquired Operating Lease Right Of Use Asset, Excluding Leases Acquired Schedule of Fair Value Measurements of Senior Notes Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Medical Claims and Benefits Payable Medical Claims And Benefits Payable [Text Block] Medical Claims And Benefits Payable Total deferred income tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Debt instrument, interest rate, stated percentage Percentage of contractual interest rate Percentage of contractual interest rate on notes Debt Instrument, Interest Rate, Stated Percentage Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Provider network Provider Network [Member] Provider Network Risk adjustment, credit loss allowances Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Credit Loss Allowance Affordable Care Act, Premium Stabilization Program, Risk Adjustment, Credit Loss Allowance Service Service [Member] Auditor Firm ID Auditor Firm ID Effective tax rate Effective Income Tax Rate Reconciliation, Percent Operating income Operating Income (Loss) Medicaid Medicaid Medicaid [Member] Medicaid [Member] Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] ROU assets impairments Operating Lease, Impairment Loss 2026 Finance Lease, Liability, to be Paid, Year Two Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net income per share: Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Individual: Individual [Axis] Building and improvements Building and improvements Building and Building Improvements [Member] Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Expected term of awards Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Restricted investments Restricted Investments, Noncurrent Expenses: Operating Expenses [Abstract] Schedule of Property and Equipment and Depreciation and Amortization Recognized Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Purchase price Fair value of net assets acquired Business Combination, Consideration Transferred Net assets of subsidiaries subject to restrictions Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Dividends received from subsidiaries Dividends Received From Subsidiaries Dividends Received From Subsidiaries Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date 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 Segments [Axis] Segments [Axis] 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] Schedule of Stock Based Compensation Expense Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Total Long-Term Debt, Gross Exercise Price Award Exercise Price Schedule of Significant Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Audit Information [Abstract] Audit Information Arrangement Duration Trading Arrangement Duration Schedule of Condensed Statements of Comprehensive Income Comprehensive Income (Loss) [Table Text Block] Operating loss carryforwards Operating Loss Carryforwards Leases Lessee, Finance Leases [Text Block] Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Stockholders’ equity: Equity, Attributable to Parent [Abstract] In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Cost of service revenue Cost Of Service Revenue Cost Of Service Revenue Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Required minimum statutory capital surplus Statutory Accounting Practices, Statutory Capital and Surplus Required Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Agreement term Debt Instrument, Term Stock purchase excise tax Share Repurchase Program, Excise Tax Future amortization expense, 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Four Total finance lease liabilities Total finance lease liabilities Finance Lease, Liability All Individuals All Individuals [Member] Amortization of capitalized software Depreciation And Amortization Of Capitalized Software Depreciation, and amortization of capitalized software. Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Fair value of debt Debt Instrument, Fair Value Disclosure Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Provider networks Provider Networks [Member] Provider networks. Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Basis Of Presentation [Table] Basis Of Presentation [Table] Basis Of Presentation [Table] Acquisition costs Business Acquisition, Transaction Costs Fair value of assets measured on recurring basis Assets, Fair Value Disclosure [Abstract] Deferred tax assets Tax Credit Carryforward, Valuation Allowance Related Party [Domain] Related and Nonrelated Parties [Domain] Amortized cost, due after five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Amounts due government agencies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Amounts Due Government Agencies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Amounts Due Government Agencies Accounts payable, accrued liabilities and other Accounts Payable and Accrued Liabilities, Current Proceeds from senior notes offerings, net of issuance costs Proceeds from Issuance of Senior Long-Term Debt Deferred income taxes, net Deferred Income Tax Liabilities, Net Risk-free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Common stock purchases (in shares) Repurchases of common stock (in shares) Stock Repurchased During Period, Shares Shares outstanding at the beginning of the period (in shares) Shares, Outstanding, Excluding Restricted Stock Awards Shares, Outstanding, Excluding Restricted Stock Awards Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Federal Deferred Federal Income Tax Expense (Benefit) Share Repurchase Program [Domain] Share Repurchase Program [Domain] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Available-for-sale, securities maturities and redemptions Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Measure: Measure [Axis] Share-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Non-current portion of long-term debt Long-Term Debt, Noncurrent, Net Of Unamortized Debt Discount Long-Term Debt, Noncurrent, Net Of Unamortized Debt Discount Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized In a Continuous Loss Position for 12 Months or More, Total Number of Positions Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Entity Emerging Growth Company Entity Emerging Growth Company Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] 2029 Long-Term Debt, Maturity, Year Five Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Maximum annual contribution per employee Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Per Employee Share based compensation arrangement by share based payment award maximum amount per employee. Minimum expected volatility rate inputs for fair value measurement Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum ROU assets - finance leases Property, equipment, and capitalized software, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Investment income and other revenue Interest and Dividend Income, Operating Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Statement [Table] Statement [Table] Significant Accounting Policies Significant Accounting Policies [Text Block] Consolidation Items [Domain] Consolidation Items [Domain] Offering period Share Repurchase Program, Period in Force Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Level 1 Fair Value, Inputs, Level 1 [Member] Other accrued medical costs Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Total current assets Assets, Current Statement of Cash Flows [Abstract] Condensed Statements of Cash Flows Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Service revenue Service Revenue Service Revenue Pharmacy payable Pharmacy Claims Payable Pharmacy Claims Payable 2027 Long-Term Debt, Maturity, Year Three Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule of Components of The Change in Medical Claims and Benefits Payable Components Of Change In Medical Claims And Benefits Payable [Table Text Block] Components Of Change In Medical Claims And Benefits Payable [Table Text Block] Short-duration Insurance Contracts, Accident Year [Axis] Short-Duration Insurance Contracts, Accident Year [Axis] 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 Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Income Taxes Income Tax Disclosure [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Numerator: Net Income (Loss) Attributable to Parent [Abstract] Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Premium tax revenue Health Care Organization, Premium Tax Revenue Health Care Organization, Premium Tax Revenue Contract rights - member list Contractual Rights [Member] Repayment of credit facility Repayments of Long-Term Lines of Credit Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Operating leases, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Premium tax expenses Premium Tax Expenses An assessment levied by a state government on the net premium income collected. Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Credit Facility [Axis] Credit Facility [Axis] Entity Registrant Name Entity Registrant Name Mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Preliminary closing adjustments Net cash paid in business combinations Payments to Acquire Businesses, Gross Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Medical margin Gross Profit Reinsurance recoverable Reinsurance Recoverable for Unpaid Claims and Claims Adjustments State Deferred State and Local Income Tax Expense (Benefit) Fair Value as of Grant Date Award Grant Date Fair Value Affiliated Entity Affiliated Entity [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Geographical [Domain] Geographical [Domain] Consolidation and Presentation Consolidation, Policy [Policy Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Finance leases Finance Lease, Interest Payment on Liability Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Common Stock Repurchase Program, September 2023 Common Stock Repurchase Program, September 2023 [Member] Common Stock Repurchase Program, September 2023 State income provision, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent U.S. Treasury notes U.S. Treasury notes US Treasury Notes Securities [Member] Other Deferred Tax Assets, Other Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Financing activities: Cash used in financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Preferred stock, $0.001 par value per share; 20 million shares authorized, no shares issued and outstanding Preferred stock, $0.001 par value; 20 million shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total deferred income tax liabilities Deferred Tax Liabilities, Gross Statutory Accounting Practices [Table] Statutory Accounting Practices [Table] Basic (in dollars per share) Net income per share - Basic (in dollars per share) Earnings Per Share, Basic Operating leases Operating Lease, Payments Cash and cash equivalents Cash and Cash Equivalents [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Stock option expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Nature of Operation, Product Information, Concentration of Risk [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Goodwill [Table] Goodwill [Table] Long-Lived Assets, including Intangible Assets Property, Plant and Equipment, Policy [Policy Text Block] Total current liabilities Liabilities, Current Share Repurchase Program [Axis] Share Repurchase Program [Axis] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Future amortization expense, 2025 Finite-Lived Intangible Asset, Expected Amortization, Year One Amount outstanding under letter of credit Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Schedule of Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Fair Value of Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Risk-free interest rate, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Business Combinations Business Combinations Policy [Policy Text Block] Maximum expected volatility rate inputs for fair value measurement Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Total revenue Revenues Total revenue Revenues Entity Address, City or Town Entity Address, City or Town Leases Lessee, Leases [Policy Text Block] Schedule of Stock Options, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Pretax Charges Share-Based Payment Arrangement, Expense Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Business Acquisition [Axis] Business Acquisition [Axis] Schedule of Identified Intangible Assets, by Major Class Schedule of Finite-Lived Intangible Assets [Table Text Block] Marketplace Marketplace [Member] Marketplace 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] Foreign Foreign Tax Jurisdiction [Member] Finance lease expense: Finance Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total assets Assets, Fair Value Disclosure Future amortization expense, 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Five Document Period End Date Document Period End Date Accounts payable and accrued liabilities (current) Finance Lease, Liability, Current Municipal securities Municipal Securities [Member] Municipal securities. Subtotal - undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Schedule of Balances of Restricted Investments Restrictions On Investments [Table Text Block] Restrictions On Investments [Table Text Block] Unvested balance, beginning of period (in shares) Unvested balance, shares end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Schedule of Business Acquisitions, by Acquisition Schedule of Business Acquisitions, by Acquisition [Table Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Document Transition Report Document Transition Report Current year Current Year Claims and Claims Adjustment Expense Acquired receivable, fair value Business Combination, Acquired Receivable, Fair Value Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Medical loss ratio of marketplace Amount To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace Amount To Government Agencies, Medicare, Medical Loss Ratio Of Marketplace Business Combination, Separately Recognized Transactions [Line Items] Business Combination, Separately Recognized Transactions [Line Items] Other operating revenues Other Operating Income Premium revenue Premiums Earned, Net Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock Repurchase Program, October 2024 Common Stock Repurchase Program, October 2024 [Member] Common Stock Repurchase Program, October 2024 Executive Category: Executive Category [Axis] ConnectiCare ConnectiCare [Member] ConnectiCare Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Company Selected Measure Name Company Selected Measure Name