Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Business Acquisition [Axis] Business Acquisition [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Deferred income taxes Deferred Income Tax Assets, Net Schedule of Available-for-Sale Investments Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Other Other Claims Payable Other Claims Payable Entity Address, Postal Zip Code Entity Address, Postal Zip Code Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Minimum Member Enrollment Targets Minimum Member Enrollment Targets [Member] Minimum Member Enrollment Targets Schedule of Liability for Unpaid Claims and Claims Adjustment Expense Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Receivable [Domain] Receivable [Domain] Fair value of debt Debt Instrument, Fair Value Disclosure 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 Total amounts due government agencies Medical Premium Liability Due To Agency Medical Premium Liability Due to Agency Medical claims and benefits payable Total Medical claims and benefits payable, beginning balance Medical claims and benefits payable, ending balance Liability for Claims and Claims Adjustment Expense 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 Fair Value Measurement [Domain] Fair Value Measurement [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Other, net Payments for (Proceeds from) Other Investing Activities Statistical Measurement [Domain] Statistical Measurement [Domain] Debt instrument, interest rate, stated percentage Percentage of contractual interest rate on notes Debt Instrument, Interest Rate, Stated Percentage Proceeds from sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Additional paid-in capital Additional Paid in Capital, Common Stock Property, equipment, and capitalized software, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Net income Net income Net Income (Loss) Attributable to Parent 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 Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Investment income Net Investment Income Equity Component [Domain] Equity Component [Domain] Insurance Claims Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Total assets Assets, Fair Value Disclosure 3.875% Notes due 2032 3.875% Senior Notes [Member] 3.875% Senior Notes Structured Securities Structured Securities [Member] Structured Securities [Member] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Extension option Health Plan, Extension Option, Period Health Plan, Extension Option, Period Operating Income Guarantee Operating Income Guarantee [Member] Operating Income Guarantee Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Amount outstanding under letter of credit Long-Term Line of Credit Common stock, $0.001 par value, 150 million shares authorized; outstanding: 58 million shares at September 30, 2022 and December 31, 2021 Common Stock, Value, Outstanding Entity Address, State or Province Entity Address, State or Province (Level 1) Fair Value, Inputs, Level 1 [Member] Number of contracts Health Plan, Number Of Contracts Health Plan, Number Of Contracts Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan [Member] Cigna Corporation's Texas Medicaid and Medicare-Medicaid Plan Weighted-average number of shares issued: Weighted Average Number of Shares Outstanding, Basic [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Operating expenses: Costs and Expenses [Abstract] Long-term debt Total Long-Term Debt, Excluding Current Maturities Minimum MLR Amounts Due To Government Agencies, Marketplace, Medical Loss Ratio Threshold Amounts Due To Government Agencies, Marketplace, Medical Loss Ratio Threshold Total liabilities Liabilities Medicaid program: Amounts Due To Government Agencies, Medicaid Program [Abstract] Amounts Due To Government Agencies, Medicaid Program [Abstract] Geographical [Axis] Geographical [Axis] Goodwill Goodwill, Purchase Accounting Adjustments Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule Of Premium Revenue By Health Plan Type [Table] Schedule of Premium Revenue by Health Plan Type [Table] Schedule of premium revenue by health plan type. 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Entity Address, City or Town Entity Address, City or Town Schedule of Premium Revenue by Health Plan Type [Line Items] Schedule of Premium Revenue by Health Plan Type [Line Items] Schedule of premium revenue by health plan type. Minimum Minimum [Member] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Stock purchases (in shares) Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Fair Value Measurements Fair Value Disclosures [Text Block] Trading Symbol Trading Symbol Entity File Number Entity File Number Average cost (USD per share) Treasury Stock Acquired, Average Cost Per Share Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Use of Estimates Use of Estimates, Policy [Policy Text Block] Business Combinations Business Combination Disclosure [Text Block] Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Total revenue Revenues Add: other operating revenues Revenues 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 Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Accounts payable, accrued liabilities and other Increase (Decrease) in Accounts Payable and Accrued Liabilities Credit Facility [Domain] Credit Facility [Domain] 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 Total Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Net income per share - Basic (in dollars per share) Earnings Per Share, Basic 4.375% Notes due 2028 4.375% Senior Notes [Member] 4.375% Senior Notes Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Increase to receivables, net of amounts due government agencies Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivables Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivables Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Total stockholders’ equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Claims incurred but not paid (“IBNP”) Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Paid (IBNP), Fee-for-service Claims, Amount Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Paid (IBNP), Fee-for-service Claims, Amount 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 Other Amounts Due to Government Agencies, Other Amounts Due to Government Agencies, Other Entity Interactive Data Current Entity Interactive Data Current Mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Retained Earnings Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Medical Claims and Benefits Payable Medical Claims And Benefits Payable [Text Block] Medical claims and benefits payable. 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Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Entity Current Reporting Status Entity Current Reporting Status Other assets Other Assets, Noncurrent Depreciation and amortization Depreciation, Depletion and Amortization Debt securities, available-for-sale Estimated Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Other revenue Interest and Dividend Income, Operating Capitation payable Capitation Claims Payable Capitation Claims Payable Other Amounts Due To Government Agencies, Medicaid, Other Amounts Due To Government Agencies, Medicaid, Other Shares outstanding at the beginning of the period ( in shares) Shares, Outstanding, Excluding Restricted Stock Awards Shares, Outstanding, Excluding Restricted Stock Awards Medical claims and benefits payable Increase (Decrease) in 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Less: other operating expenses Costs and Expenses Debt Instrument [Line Items] Debt Instrument [Line Items] Business Combination and Asset Acquisition [Abstract] Class of Stock [Line Items] Class of Stock [Line Items] 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 Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Pharmacy payable Pharmacy Claims Payable Pharmacy Claims Payable Segments Segment Reporting Disclosure [Text Block] 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] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] In a Continuous Loss Position 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