Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Investment grade Investment Grade [Member] External credit-ratings or internal groupings that could be used to describe the current status of the payment and performance risk of debt and securities investments that connote investment grade. Trading Arrangement: Trading Arrangement [Axis] Purchases, sales and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] (Income) loss attributable to noncontrolling interests Income Loss Attributable To Noncontrolling Interest Before Tax Amount of pre-tax income (loss) attributable to noncontrolling interest. Title of 12(b) Security Title of 12(b) Security Carrying Value Reported Value Measurement [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Subsequent Event Subsequent Event [Member] Deferred tax expenses (benefits) Deferred tax expenses Special Item Charge Benefit Tax Matters Special Item Charge Benefit Tax Matters Total Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Amortized Cost Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Amortized Cost Non-current Insurance And Contractholder Liabilities, Noncurrent [Abstract] Insurance And Contractholder Liabilities, Noncurrent Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Securities Priced by the Company Unobservable Inputs Developed By Company [Member] Significant unobservable inputs used in pricing Level 3 securities that were developed directly by the Company. Restructuring Plan [Axis] Restructuring Plan [Axis] Separate Account Asset Category [Axis] Separate Account Asset Category [Axis] Future policy benefits reserve, reinsurance recoverables Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance Ongoing operations Ongoing Operations [Member] Revenue from External Customers by Products and Services [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] Collateralization risk Ceded Credit Collateralization Risk [Member] Concentration risk related to collateralization of a specified benchmark, such as reinsurance recoverables. Guarantee liability Guarantee liability Loss Contingency Accrual Separate account assets Separate Account Asset Maximum guarantee exposure Guarantor Obligations, Maximum Exposure, Undiscounted Revenues from customers Total revenues from external customers Non Investment Revenue Revenue excluding net investment income and realized investment results. Less: Reinsurance, including held for sale liabilities Add: Reinsurance, including held for sale liabilities Reinsurance Recoverable For Unpaid Claims And Claims Adjustments Including Disposal Groups Reinsurance Recoverable For Unpaid Claims And Claims Adjustments Including Disposal Groups Derivative Instrument [Axis] Derivative Instrument [Axis] Other comprehensive income (loss), before reclassifications, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Assumption changes Market Risk Benefit, Increase (Decrease) from Other Assumption BBB+ equivalent and higher current ratings Nationally Recognized Statistical Rating Organizations (NRSRO), BBB+ Or Higher [Member] Nationally Recognized Statistical Rating Organizations (NRSRO), BBB+ Or Higher Interest accretion rate Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate Measurement Frequency [Axis] Measurement Frequency [Axis] Federal government and agency US Treasury and Government [Member] Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount Commercial paper average interest rate Commercial Paper, Average Rate Paid Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 80% to 100% Debt-to-Value Ratio, 80 to 100 Percent [Member] Mortgage and other asset-backed Mortgage and other asset-backed securities Asset-Backed Securities [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Axis] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Axis] Unrealized Depreciation Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Separate Account, Guaranteed Separate Accounts Separate Account, Guaranteed Separate Accounts [Member] Separate Account, Guaranteed Separate Accounts Other intangible assets Intangible Asset, Excluding Goodwill, after Accumulated Amortization Long-term investments Investments per Consolidated Balance Sheets Long-Term Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of Reportable Segments Number of Reportable Segments Total current liabilities Liabilities, Current Summary of Derivative Instruments Held Schedule of Derivative Instruments [Table Text Block] Total Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Reinsured market risk benefit, end of period Market risk benefits Market Risk Benefit, Reinsurance Recoverable, after Allowance Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Pharmacy revenues Product [Member] Loss contingency accrual, period increase (decrease) Loss Contingency Accrual, Period Increase (Decrease) Market risk benefits Market Risk Benefit, Liability, Amount Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Incurred costs related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Average attained age of contractholders (weighted by exposure) Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age Future Policy Benefits Liability for Future Policy Benefit [Policy Text Block] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Dividends [Domain] Dividends [Domain] Insurance Loss Reserves [Abstract] Insurance Loss Reserves [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Derivative gain (loss) recognized in other comprehensive income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Investment Income [Table] Investment Income [Table] Less than 80 percent Debt-to-Value Ratio, Less than 80 Percent [Member] Summarized Segment Financial Information Segment Reporting [Table Text Block] Other comprehensive loss Temporary Equity Other Comprehensive Income (Loss) The portion of other comprehensive income or(loss) attributable to temporary equity interest. Acquisition, disposition or run-off activities Acquisition Disposition Runoff Activities [Member] Products related to acquisition, disposition or runoff activities. Reinsurance recoverables before market risk benefits Reinsurance Recoverables, Gross Insurance And Contractholder Liabilities [Table] Insurance And Contractholder Liabilities [Table] Ceded Credit Risk, Collateralization [Domain] Ceded Credit Risk, Collateralization [Domain] 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 Document Period End Date Document Period End Date Corporate Corporate And Government Debt Securities [Member] This category includes information about debt securities that are issued by either a domestic or foreign corporate business entity with a promise of repayment. Liabilities of businesses held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Principal Debt Instrument, Face Amount Credit agreement term Debt Instrument, Term Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Contractholder deposit funds Contractholder deposit funds Policyholder Contract Deposit Balance, beginning of year Balance, end of period Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] (Gain) loss on sale of business(es) Special Item, Gain (Loss) On Sale Of Business, Before Taxes Special Item, Gain (Loss) On Sale Of Business, Before Taxes Change in discount rate for certain long-duration liabilities AOCI, Liability for Future Policy Benefit, Parent [Member] Commercial mortgage loans Mortgages [Member] Net amount at risk Net Amount at Risk by Product and Guarantee, Net Amount at Risk Investments by category and current or long-term classification Investment Holdings, Schedule of Investments [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Shareholders' net income per share Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Revenue from External Customers Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] Financial Guarantees Financial Guarantee [Member] TOTAL LIABILITIES Liabilities Trading Symbol Trading Symbol Weighted Average Cost of Capital Measurement Input, Discount Rate [Member] Noninsurance customer receivables Noninsurance Customer Receivables Excluding Pharmaceutical Manufacturers Receivable Receivables due from customers that are not under insurance contracts. These include pharmacy sales and fees due from employer clients. Total Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Company Selected Measure Name Company Selected Measure Name Gains (losses) included in Other comprehensive loss Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Contractholder deposit funds, current Policyholder Contract Deposit, Current Policyholder Contract Deposit, Current Equity securities with readily determinable fair values Equity Securities, FV-NI, Cost Unpaid claims and claim expenses Beginning balance Ending balance Liability for Claims and Claims Adjustment Expense Credit Facility [Domain] Credit Facility [Domain] Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Amount per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid contractual allowances for third-party payor noninsurance customer receivables Contractual Allowance, Noninsurance Customer Receivables Amount of contractual allowances from third-party payors based upon the contractual payment terms. Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Disposal Group Name [Domain] Disposal Group Name [Domain] Current Insurance And Contractholder Liabilities, Current [Abstract] Insurance And Contractholder Liabilities, Current Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Components of Net Investment Income Investment Income [Table Text Block] Integration and transaction-related costs Integration and transaction-related costs Transaction Related Costs Pre-tax transaction-related costs primarily consisting of fees for legal, advisory and other professional services, as well as employee costs. Investment maturities and repayments: Proceeds from Sale and Maturity of Held-to-Maturity Securities [Abstract] Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 To 0400 Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 [Member] Summary of Special Items Schedule Of Special Items [Table Text Block] Schedule of pre- and after-tax amounts reported as special items, attributable to the parent. Special items are amounts that management does not believe are representative of underlying results of operations. Corporate and Eliminations Corporate And Eliminations [Member] Reflects amounts not allocated to other segments, such as net interest expense (defined as interest on corporate debt less net investment income on investments not supporting segment operations), interest on uncertain tax positions, certain litigation matters, intersegment eliminations, compensation cost for stock options, expense associated with its frozen pension plans, certain corporate project and overhead costs. Pharmaceutical manufacturer receivables Pharmaceutical Manufacturer Receivable Receivables due from pharmaceutical manufacturers related to rebate contracts. Mortgage and other asset-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] Net investment (losses) gains Investment gains, net Net Investment Gain Loss Gains (losses) based on specifically identified assets and resulting from sales, investment asset write-downs, changes in the fair value of certain derivatives and equity securities and changes in allowances for credit losses on debt securities and commercial mortgage loan investments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Medical costs and other benefit expenses Policyholder Benefits and Claims Incurred, Net Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Beginning balance, net Ending balance, net Liability for Unpaid Claims and Claims Adjustment Expense, Net Consolidated effective tax rate Effective Income Tax Rate Reconciliation, Percent Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Beginning balance, net, including held for sale liabilities Ending balance, net, including held for sale liabilities Liability For Unpaid Claims And Claims Adjustment Expense Net Including Disposal Groups Liability For Unpaid Claims And Claims Adjustment Expense Net Including Disposal Groups Credit agreement term extension Debt Instrument, Extension Term Debt Instrument, Extension Term Common stock equivalents Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Total Insurance And Contractholder Liabilities [Abstract] Insurance And Contractholder Liabilities Nonperformance risk (own credit risk), end of period AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax Long-term debt, including current maturities, excluding finance leases Long-Term Debt, Fair Value Antidilutive Securities [Axis] Antidilutive Securities [Axis] Variances in Incurred Costs Related to Prior Years' Unpaid Claims and Claims Expenses Schedule of Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Adjusted revenues Segment Revenues Total revenues less realized investment gains from equity method subsidiaries, special items and other reconciling items determined by management. Concentration Risk Type [Domain] Concentration Risk Type [Domain] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Paid costs related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Factoring fees paid, uncommitted factoring facilities Accounts Receivable, Uncommitted Factoring Facilities, Factoring Fees Paid Factoring fees paid under uncommitted Account Receivable factoring facilities. Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Withdrawals and benefit payments from contractholder deposit funds Withdrawal from Contract Holders Funds Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Balance, beginning of year, before the effect of nonperformance risk (own credit risk) Balance, end of period, before the effect of changes in nonperformance risk (own credit risk) Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Outstanding balances Long-Term Line of Credit Unearned Premium Insurance, Unearned Premiums [Policy Text Block] Insurance, Unearned Premiums Common stock dividend paid Total amount paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Hedging Relationship [Axis] Hedging Relationship [Axis] Total equity Balance Balance Equity, Including Portion Attributable to Noncontrolling Interest Net long-duration insurance and contractholder liabilities measurement adjustments OCI, Liability For Future Policy Benefit And Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), After Reclassification Adjustment And Tax, Portion Attributable To Parent OCI, Liability For Future Policy Benefit And Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), After Reclassification Adjustment And Tax, Portion Attributable To Parent Total of incurred but not reported liabilities plus expected claim development on reported claims and reported claims in process Liability For Claims And Claims Adjustment Expense Excluding Physician Incentives And Other Expenses Represents the total liability for incurred but not reported claims plus expected claim development on reported claims, including reported claims in process. Excludes amounts due for physician incentives and other medical care expenses and services payable. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Issuance of common stock Proceeds from Issuance of Common Stock One year or less Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less Than 12 Months [Abstract] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less Than 12 Months Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Accounts receivable, net Increase (Decrease) in Accounts and Other Receivables Real Estate Loan Real Estate Loan [Member] Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Debt securities and equity securities Payments To Acquire Debt And Equity Securities Payments To Acquire Debt And Equity Securities Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Segments [Domain] Segments [Domain] Interest Rate Swap Interest Rate Swap [Member] Cash, cash equivalents and restricted cash January 1, including held for sale assets Cash, cash equivalents and restricted cash December 31, including held for sale assets Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Investments including held for sale assets Long Term Investments Before Reclassification To Disposal Group Assets Held For Sale Long Term Investments Before Reclassification To Disposal Group Assets Held For Sale Debt Debt Disclosure [Text Block] Below investment grade Below Investment Grade [Member] External credit-ratings or internal groupings that could be used to describe the current status of the payment and performance risk of debt and securities investments that connote non-investment grade. Disposal Group Classification [Domain] Disposal Group Classification [Domain] Fair Values of Separate Account Assets Fair Value Of Separate Account Assets [Table Text Block] Disclose the aggregate fair value of separate account assets, by fair value level. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Renewable energy tax credit equity investments Payments to Acquire Equity Method Investments Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Interest rate Debt Instrument, Interest Rate, Stated Percentage Common dividends declared Dividends, Common Stock, Cash TOTAL SHAREHOLDERS' EQUITY Equity, Attributable to Parent Debt extinguishment costs (gains), after-tax Special Item Charges Debt Extinguishment Costs Net Of Tax Special Item Charges Debt Extinguishment Costs Net Of Tax Assets Assets [Abstract] More than one year Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months Or Longer [Abstract] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months Or Longer Summary of the Credit Risk Profile of the Commercial Mortgage Loan Portfolio Financing Receivable Credit Quality Indicators [Table Text Block] Insider Trading Policies and Procedures [Line Items] allowances for current expected credit losses Accounts Receivable, Allowance for Credit Loss, Current Cost Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Amortized Cost [Abstract] Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Amortized Cost Total incurred Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Nicole Jones [Member] Nicole Jones Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Antidilutive options Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Weighted average crediting rate Policyholder Account Balance, Weighted Average Crediting Rate Additional paid-in capital Additional Paid in Capital, Common Stock Fees Service, Fees [Member] Service, Fees Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Total (losses) gains included in Shareholders' net income attributable to instruments held at the reporting date Fair Value, Asset, Recurring Basis, Still Held, Realized Gain (Loss) This element represents total gains or losses for the period (realized and unrealized), arising from assets included in income attributable to instruments held at the reporting date, measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in asset value. Indemnification obligations Indemnification Agreement [Member] Other comprehensive income (loss) before reclassifications, after-tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Variable Annuity Variable Annuity [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Investment, Name [Axis] Investment, Name [Axis] Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Reinsurance Reinsurance Accounting Policy [Policy Text Block] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Unfunded commitments Commitments To Contribute Additional Equity And Capital Investment commitments of estimated payments required under contractual arrangements diversified by issuer, property type and geographic regions. Medicare Advantage Medicare Advantage [Member] VillageMD VillageMD [Member] VillageMD Actual completion factors and other Completion Factors And Other [Member] Amounts relating to actual claims emerging differently from assumptions about claim payment speed used to set reserves, as well as other factors impacting prior year reserves. Service, Fees And Other Revenues [Member] Service, Fees And Other Revenues [Member] Service, Fees And Other Revenues Non-current insurance and contractholder liabilities Non-current insurance and contractholder liabilities Insurance And Contractholder Liabilities Noncurrent The carrying amounts as of the balance sheet date of all current insurance and contractholder liabilities. Accumulated Other Comprehensive (Loss) AOCI Attributable to Parent AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] 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] Adjusted EBITDA Volatility Measurement Input, Option Volatility [Member] Commitment and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Average Debt Service Coverage Ratio Financing Receivable, Credit Quality Debt Service Coverage Ratio Financing Receivable, Credit Quality Debt Service Coverage Ratio Statement [Line Items] Statement [Line Items] TOTAL ASSETS Assets Separate Account, Non-Guaranteed Separate Accounts Separate Account, Non-Guaranteed Separate Accounts [Member] Separate Account, Non-Guaranteed Separate Accounts Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Accounts Receivable Accounts Receivable [Policy Text Block] 4.500% Notes due September 2030 $1,000 million, 4.500% Notes Due September 2030 [Member] $1,000 million, 4.500% Notes Due September 2030 Liability for Future Policy Benefit Activity [Table] Liability for Future Policy Benefit Activity [Table] Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At Target Level [Member] Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At Target Level Operating Segments Operating Segments [Member] Equity securities with no readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount 5.250% Notes due January 2036 $1,500 million, 5.250% Notes Due January 2036 [Member] $1,500 million, 5.250% Notes Due January 2036 Unrealized Appreciation Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Mortgage and other asset-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value PEO PEO [Member] Property and equipment purchases, net Payments For (Proceeds From) Property, Plant, And Equipment Payments For (Proceeds From) Property, Plant, And Equipment Other non-current liabilities Other Liabilities, Noncurrent Reinsurer Concentration Risk Reinsurer Concentration Risk [Member] Ceded Credit Risk, Reinsurer [Domain] Reinsurer, Name [Domain] Goodwill Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Number of Issues Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Insurance and Contractholder Liabilities [Line Items] Insurance and Contractholder Liabilities [Line Items] Liability for Future Policy Benefit Activity [Line Items] Liability for Future Policy Benefit, Activity [Line Items] No Collateral Ceded Credit Risk, Unsecured [Member] Retained Earnings Retained Earnings [Member] Unpaid claims classified as liabilities of business held for sale Disposal Group, Including Discontinued Operation, Liability for Unpaid Claims and Claims Adjustment Expense Revolving Credit Facility Revolving Credit Facility [Member] Less: Net income attributable to other noncontrolling interests Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Changes in Total Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Translation of foreign currencies Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Fair Value Disclosures for Financial Instruments Not Carried at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Corporate Corporate Debt Securities [Member] Diluted (in dollars per share) Earnings per share, diluted Earnings Per Share, Diluted Real estate investments Real Estate Investment [Member] Amortization of acquired intangible assets Amortization of acquired intangible assets Intangible Asset, Finite-Lived, Amortization Expense Ceded Credit Risk, Reinsurer [Axis] Reinsurer, Name [Axis] Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Reclassification adjustment, tax Reclassification from AOCI, Current Period, Tax Revenue from contract with customer Revenue from Contract with Customer, Excluding Assessed Tax Less: Income attributable to noncontrolling interests Other Segment Items, Income (Loss) Attributable To Noncontrolling Interests, Before Tax Other Segment Items, Income (Loss) Attributable To Noncontrolling Interests, Before Tax Other revenue Service, Other [Member] Unpaid claims and claim expenses, current Liability For Claims And Claims Adjustment Expense, Current Liability For Claims And Claims Adjustment Expense, Current Roll forward of Accrued Liability Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Assets of businesses held for sale Disposal Group, Including Discontinued Operation, Assets, Current Net realized investment (gains) losses Net Investment Gain Loss Including Equity Method Subsidiaries Gains (losses), including those from equity method subsidiaries, based on specifically identified assets and resulting from sales, investment asset write-downs, changes in the fair value of certain derivatives and equity securities and changes in allowances for credit losses on debt securities and commercial mortgage loan investment Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Net amount at risk Policyholder Account Balance, Net Amount at Risk Subsegments [Domain] Subsegments [Domain] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Payment term (in months) Supplier Finance Program, Payment Timing, Period Purchaser credit spread Measurement Input, Entity Credit Risk [Member] Account value Net Amount at Risk by Product and Guarantee, General Account Value Investments Credit Rating [Domain] Investments Credit Rating [Domain] External credit-ratings or internal groupings that could be used to describe the current status of the payment and performance risk of debt and securities investments. Guarantees Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Debt-to-Value [Domain] Debt-to-Value [Domain] Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Derivative gain (loss) recognized in the income statement Derivative, Gain (Loss) on Derivative, Net Income from operations Operating Income (Loss) Fees and other revenues Service Service [Member] Total Short-Term And Long-Term Investments [Abstract] Short-Term And Long-Term Investments Pharmacy and other service costs payable Pharmacy And Service Costs Payable Reflects amounts due to pharmacies for prescriptions filled through our retail network of pharmacies. Also includes amounts due to clients for their portion of rebates that must be contractually shared. Foreign government Debt Security, Government, Non-US [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Equity securities Equity Securities [Member] Policy loans Policy loans Policy Loans [Member] Gains (losses) required to adjust future policy benefits for settlement annuities Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Required To Adjust Future Policy Benefits This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in gains or losses required to adjust future policy benefits for settlement annuities. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, 12 Months Or Longer, Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, 12 Months Or Longer, Amortized Cost Guaranty Fund Assessments Insurance-related Assessments [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Policyholder Account Balance, at Guaranteed Minimum Crediting Rate Policyholder Account Balance, at Guaranteed Minimum Crediting Rate [Member] Unrealized Depreciation Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Charges (benefits) associated with litigation matters (Benefits) charges associated with litigation matters Special Item Charge (Benefit) Before Tax Litigation After-tax charges associated with litigation matters that are classified as special items, attributable to the parent. Special items reflect amounts that management does not believe are representative of underlying results of operations. Product and Service [Domain] Product and Service [Domain] BBB- to BBB+ equivalent current credit ratings Nationally Recognized Statisical Rating Organizations (NRSRO), BBB- To BBB+ Rating [Member] Nationally Recognized Statisical Rating Organizations (NRSRO), BBB- To BBB+ Rating Deferred tax liabilities, net Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Termination Date Trading Arrangement Termination Date Reinsurance Recoverables, Gross, Acquisition Disposition Runoff Activities, Nationally Recognized Statistical Rating Organizations, BBB+ Or Higher Reinsurance Recoverables, Gross, Acquisition Disposition Runoff Activities, Nationally Recognized Statistical Rating Organizations, BBB+ Or Higher [Member] Reinsurance Recoverables, Gross, Acquisition Disposition Runoff Activities, Nationally Recognized Statistical Rating Organizations, BBB+ Or Higher Less: Divestiture and other Liability for Unpaid Claims and Claims Adjustment Expense, Divestiture and Other Amount of decrease (increase) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the divesture and/or re-segmentation of business unit(s). Includes, but is not limited to, claims which have been incurred but not reported. Remaining overall limit under reinsurance agreement Ceded Reinsurance Agreement, Coverage Limit, Amount Remaining Amount remaining of overall limit to claims covered under ceded reinsurance agreement. Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Leverage ratio covenant Line Of Credit Facility Debt To Adjusted Capital Ratio Covenant The debt-to adjusted capital ratio which the Company must not exceed in accordance with the terms of the line of credit facility agreement. Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Postretirement benefits liability adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Current year Current Year Claims and Claims Adjustment Expense Fair Value Marketable Securities Total impact from special items, pre-tax Special Item Gain Or Loss Before Tax Attributable To Reporting Entity Sum of before-tax tax amounts classified as special items, attributable to the parent. Special items are excluded from the calculation of 'adjusted income (loss) from operations' because management believes they are not representative of the underlying results of operations. This is generally because the nature and size of these matters are not indicative of our ongoing business operations. Total transfers into / (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value as of Grant Date Award Grant Date Fair Value Summary of Debt Securities with a Decline in Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Change in Redeemable Noncontrolling Interests Increase (Decrease) in Temporary Equity [Roll Forward] Net long-duration insurance and contractholder liabilities measurement adjustments AOCI, Liability For Future Policy Benefit And Market Risk Benefit, Instrument-Specific Credit Risk, Parent [Member] AOCI, Liability For Future Policy Benefit And Market Risk Benefit, Instrument-Specific Credit Risk, Parent Current insurance and contractholder liabilities Current insurance and contractholder liabilities Insurance And Contractholder Liabilities Current The carrying amounts as of the balance sheet date of all current insurance and contractholder liabilities. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Unrealized Depreciation Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Allowance for uncollectible reinsurance Reinsurance Recoverable, Allowance for Credit Loss Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] TOTAL REVENUES Revenues Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Percent of debt securities classified in Level 3 Debt Securities Classified In Level 3 Percentage Debt Securities Classified In Level 3 Percentage Maximum total commitment Line Of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature Line Of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature Strategic Optimization Program Strategic Optimization Program [Member] Strategic Optimization Program Outstanding payment obligations, supplier finance program Supplier Finance Program, Obligation All Award Types Award Type [Domain] Litigation Matters and Regulatory Matters Litigation Matters And Regulatory Matters [Member] Litigation Matters And Regulatory Matters Fair Value Measurements Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Separate account assets Separate Account Asset, At Carrying Value Separate Account Asset, At Carrying Value Future Policy Benefit Activity Liability for Future Policy Benefit, Activity [Table Text Block] Contractholder Deposit Funds Contractholder Deposit Funds, Policy [Policy Text Block] Describes an entity's accounting policy for contractholder deposit funds. Market risk benefits, non-current Market Risk Benefit, Liability, Amount, Noncurrent Market Risk Benefit, Liability, Amount, Noncurrent Shares repurchased Treasury Stock, Shares, Acquired Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] NAV Fair Value Measured at Net Asset Value Per Share [Member] Interest expense on long-term and short-term debt Interest Expense, Debt Repurchase of common stock Treasury Stock, Value, Acquired, Cost Method Payments Payments for Restructuring Cash, cash equivalents and restricted cash and cash equivalents January 1, Cash, cash equivalents and restricted cash, end of year (1) Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Short-term investments and cash Cash Cash Equivalents And Short Term Investments [Member] Aggregate of cash, cash equivalents and short-term investments. Non-NEOs Non-NEOs [Member] 6.000% Notes due January 2056 $750 million, 6.000% Notes Due January 2056 [Member] $750 million, 6.000% Notes Due January 2056 Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due Market Risk Benefit Reinsurance Recoverable After Allowance And Related Balances [Member] Market risk benefit reinsurance recoverable, including IBNR and outstanding claims, less premiums due. Investment, Name [Domain] Investment, Name [Domain] 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 Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Noncatastrophic Event [Axis] Noncatastrophic Event [Axis] Repurchase of common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Investments Credit Rating [Axis] Investments Credit Rating [Axis] Information by credit rating of debt and securities investments. Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Equity securities with readily determinable fair values Equity securities Equity Securities, FV-NI Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Plans Pension Plan [Member] Common Stock Common Stock [Member] Debt Securities Debt Securities, Available-for-Sale Outstanding payment obligations, current Supplier Finance Program, Obligation, Current Employee severance Employee Severance [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Text Block] Disclousre of the changes in the componenets of other comprehensive income/loss. Derivative Contract [Domain] Derivative Contract [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity securities with no readily determinable fair value Equity Securities Without Readily Determinable Fair Value, Amortized Cost Equity Securities Without Readily Determinable Fair Value, Amortized Cost Equity Volatility Measurement Input, Equity Price Volatility [Member] Measurement Input, Equity Price Volatility Total liabilities and equity Liabilities and Equity Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Ceded Credit Risk [Table] Ceded Credit Risk [Table] Employee Stock Options Share-Based Payment Arrangement, Option [Member] Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Noncontrolling interests Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Strategic optimization program costs Strategic optimization program Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Less: Reinsurance and other amounts recoverable Add: Reinsurance and other amounts recoverable Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Gross Unrealized Appreciation (Depreciation) on Debt Securities Unrealized Gain (Loss) on Investments [Table Text Block] Reinsurance recoverable and Other assets Increase (Decrease) in Reinsurance Recoverable Pharmacy and other service costs payable Increase Decrease In Pharmacy And Service Costs Payable Number of reinsurers Reinsurance Recoverables, Number Of Reinsurers Reinsurance Recoverables, Number Of Reinsurers Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Debt-to-Value [Axis] Debt-to-Value [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Cost of Goods and Service Cost of Goods and Service [Policy Text Block] Net amounts reclassified from AOCI to net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Deferred profit liability included in future policy benefits Liability For Future Policy Benefits, Deferred Profit Liability Liability For Future Policy Benefits, Deferred Profit Liability Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Ceded Credit Risk, Collateralization [Axis] Ceded Credit Risk, Collateralization [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Strategic Optimization Program Restructuring and Related Activities Disclosure [Text Block] Other All Segments Excluding Cigna Healthcare [Member] All Segments Excluding Cigna Healthcare Long-term debt Long-Term Debt and Lease Obligation Name Measure Name Net Amount at Risk by Product and Guarantee [Line Items] Net Amount at Risk by Product and Guarantee [Line Items] Operating results of certain non-strategic businesses Operating Results Of Certain Nonstrategic Businesses [Member] Operating Results Of Certain Non-strategic Businesses Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Operations Other Operating Segment [Member] Number of Issues Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Debt Instrument [Line Items] Debt Instrument [Line Items] Additional Paid-in Capital Additional Paid-in Capital [Member] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) [Axis] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) [Axis] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Dividends Payable, Date Declared Dividends Payable, Date Declared Investments purchased or originated: Payments to Acquire Investments [Abstract] Changes due to policyholder behavior versus expected Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected Guaranteed Minimum Death Benefits Total Contractholders Net Amount At Risk By Product And Guarantee, Number Of Contractholders Estimated Net Amount At Risk By Product And Guarantee, Number Of Contractholders Estimated Company Selected Measure Amount Company Selected Measure Amount Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Investments classified as assets of business held for sale Disposal Group, Including Discontinued Operation, Investments Disposal Group, Including Discontinued Operation, Investments Future policy benefits, current Liability For Future Policy Benefit, Before Reinsurance, Current Liability For Future Policy Benefit, Before Reinsurance, Current Depreciation and amortization Depreciation, Depletion and Amortization Debt securities and equity securities Proceeds From Sale Of Debt And Equity Securities Proceeds from sales of debt and equity securities. Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At Zero PercentTarget Level [Member] Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At Zero PercentTarget Level Non-PEO NEO Non-PEO NEO [Member] Assets maintained by employers (minimum) Guarantor Obligations, Liquidation Proceeds, Monetary Amount Net income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Pharmacy and other service costs Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] SHAREHOLDERS' NET INCOME SHAREHOLDERS' NET INCOME Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Below 60% LTV Less Than 60 Percent [Member] Market Risk Benefit [Roll Forward] Market Risk Benefit [Roll Forward] Changes in the Components of AOCI Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Pre-tax adjustments to reconcile to adjusted income from operations Pretax Adjustments To Reconcile Adjusted Income From Operations [Abstract] Net proceeds on issuance of term loan Proceeds from Notes Payable Supplier Finance Program Supplier Finance Program [Table Text Block] Future policy benefit, excluding deferred profit liability Liability For Future Policy Benefit, Excluding Deferred Profit Liability Liability For Future Policy Benefit, Excluding Deferred Profit Liability Commercial mortgage loans Mortgage Loans on Real Estate, Commercial and Consumer, Net Reinsurance Disclosures [Abstract] Reinsurance Disclosures [Abstract] Revenues Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Securities and derivatives AOCI, Accumulated Gain (Loss), Debt Securities, Available-For-Sale And Derivatives, Parent [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-For-Sale And Derivatives, Parent Statistical Measurement [Domain] Statistical Measurement [Domain] Unfunded commitments, percentage expected to fund in next fiscal year Unfunded Commitments, Percentage Expected To Fund In Next Fiscal Year Unfunded Commitments, Percentage Expected To Fund In Next Fiscal Year Policyholder Account Balance [Line Items] Policyholder Account Balance [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Other revenues Other Pharmacy [Member] 60% to 79% LTV 60 to 79 Percent [Member] Common stock Common Stock, Value, Issued Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Stop loss Stop Loss [Member] An insurance product that provides additional coverage on Administrative Services Only plans that provides reimbursement for claims in excess of a predetermined amount. Long-term Long-Term Investments [Abstract] Amendment Flag Amendment Flag Disposal Group Classification [Axis] Disposal Group Classification [Axis] Net investment income Net investment income Net investment income (loss) Net Investment Income Unrealized Depreciation Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Loss Contingencies [Table] Loss Contingencies [Table] Impairment of dividend receivable Dividends Receivable, Impairment Loss Dividends Receivable, Impairment Loss Investments [Domain] Investments [Domain] Held-for-Sale Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Maturity date Debt Instrument, Maturity Date Deferred income tax benefit Increase (Decrease) in Deferred Income Taxes Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Net investment results from certain equity method investments Net Investment Gains Losses Equity Method Investments Gains (losses), attributable to equity method investment, based on specifically identified assets and resulting from sales, investment asset write-downs, changes in the fair value of certain derivatives and equity securities and changes in allowances for credit losses on debt securities and commercial mortgage loan investment Entity Address, State or Province Entity Address, State or Province Basis points above guaranteed minimum crediting rate Policyholder Account Balance, above Guaranteed Minimum Crediting Rate After-tax Special Items After Tax [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Financial assets at fair value: Assets, Fair Value Disclosure [Abstract] Notional Value Derivative, Notional Amount Investments classified as assets of business held for sale Disposal Group Including Discontinued Operation Noncurrent Investments Current Disposal Group Including Discontinued Operation Noncurrent Investments Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Network revenues Network Pharmacy [Member] Market Risk Benefits Market Risk Benefit [Policy Text Block] Investments [Abstract] Investments [Abstract] 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 Everett Neville [Member] Everett Neville Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] Reinsurance, Reinsured Risk, Percentage Reinsurance, Reinsured Risk, Percentage Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Integration and transaction-related costs, after-tax Transaction Related Costs After Tax After-tax transaction-related costs including the impact of tax benefits realized from termination of merger agreement. Transaction-related costs consist primarily of fees for legal, advisory and other professional services as well as employee costs. Accounts Receivable, Net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Commercial paper Commercial Paper Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Selling, general and administrative expenses Selling, General Administrative Expenses Segment Performance Metric Selling, General Administrative Expenses Segment Performance Metric Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Risk corridors recovery Risk corridors recovery Special Item, Gain (Loss) On Risk Corridor Allowance Adjustment, Before Taxes Special Item, Gain (Loss) On Risk Corridor Allowance Adjustment, Before Taxes Separate Accounts Policyholder Accounts, Policy [Policy Text Block] Other receivables Accounts and Other Receivables, Net, Current Insurance liabilities Increase (Decrease) in Insurance Liabilities Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other restructuring Other Restructuring [Member] Deferred tax expenses (benefits), after-tax Special Item Charge Benefit Tax Matters After Tax Special Item Charge Benefit Tax Matters After Tax Carrying value, after allowance for credit loss Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Insurance customer receivables Insurance Customer Receivables Receivables due from customers under insurance contracts. Less investment expenses Investment Income, Investment Expense Less: Treasury stock, at cost Treasury Stock, Value Correlation Measurement Input, Inter-Variable Correlation Assumption [Member] Measurement Input, Inter-Variable Correlation Assumption Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Recent Accounting Pronouncements, Recently Adopted Accounting Guidance and Accounting Guidance Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Other Non- controlling Interests Noncontrolling Interest [Member] Separate accounts assets classified in Level 3, period increase (decrease), including transfers in and out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) Total purchases, sales and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Weighted average Weighted Average Number of Shares Issued, Basic Receivables collected but not remitted to the financial institution Accounts Receivable, Uncommitted Factoring Facilities, Accounts Receivable Received But Not Remitted Amount of, as of the reporting date, of receivables sold to a financial institution under uncommitted Accounts receivable factoring facilities that have been received from the manufacturers but not yet remitted to the financial institution. Individual and Family Plans Individual And Family Plans [Member] Accounts payable and Accrued expenses and other liabilities Increase Decrease In Accounts Payable Accrued And Other Operating Liabilities The increase (decrease) during the reporting period in the aggregate amount of accounts payable, accrued liabilities and other operating obligations not separately disclosed in the statement of cash flows. Impairments requiring certain assets and liabilities to be measured at fair value Impairments Requiring Certain Assets And Liabilities To Be Measured At Fair Value Impairments requiring certain financial assets and liabilities, such as commercial mortgage loans that are carried at unpaid principal, investment real estate that is carried at depreciated cost and equity securities with no readily determinable fair value when there are no observable market transactions, to be measured using fair value. These financial assets and liabilities may be measured using fair value under certain conditions, such as when investments become impaired and are written down to their fair value, or when there are observable price changes from orderly market transactions of equity securities that otherwise had no readily determinable fair value. Securities partnerships Other Security Investments [Member] Net changes in assets and liabilities, net of non-operating effects: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Security Exchange Name Security Exchange Name Strategic optimization program costs, after-tax Strategic optimization program, after-tax Restructuring Charges, Net Of Tax Expense Restructuring Charges, Net Of Tax Expense Unearned premiums, non-current Unearned Premiums, Noncurrent Unearned Premiums, Noncurrent Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Beginning balance, including held for sale liabilities Ending balance, including held for sale liabilities Liability For Claims And Claims Adjustment Expense Including Disposal Groups Liability For Claims And Claims Adjustment Expense Including Disposal Groups Supplier Finance Program Supplier Finance Program [Text Block] Earnings per share, effect of dilution Earnings Per Share Effect Of Dilution The decrease in net income (loss) on a per share basis when the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period is assumed. Organizational Efficiency Plan Organizational Efficiency Plan [Member] Organizational Efficiency Plan Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Segment Information Segment Reporting, Policy [Policy Text Block] Commercial mortgage loans Payments to Acquire Mortgage Notes Receivable Other transactions impacting noncontrolling interests Noncontrolling Interest Other Changes Other activity associated with noncontrolling interest that is not separately disclosed. Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Total impact from special items, after-tax Special Item Gain Or Loss Net Of Tax Attributable To Reporting Entity Sum of after-tax amounts classified as special items, attributable to the parent. Special items are excluded from the calculation of 'adjusted income (loss) from operations' because management believes they are not representative of the underlying results of operations. This is generally because the nature and size of these matters are not indicative of our ongoing business operations. Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Charges (benefits) associated with litigation matters, after-tax Special Item Charge (Benefit) After Tax Litigation After-tax charges associated with litigation matters that are classified as special items, attributable to the parent. Special items reflect amounts that management does not believe are representative of underlying results of operations. Favorable (unfavorable) variance, percentage Liability For Unpaid Medical Claims And Claims Adjustment Expense Incurred Claims Prior Years Percentage Amount of payments made in the reporting period to settle claims incurred in prior periods and related claims settlement costs as a percentage of incurred claims as reported in the prior year. Total insurance and contractholder liabilities Insurance And Contractholder Liabilities Insurance And Contractholder Liabilities 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Debt extinguishment costs (gains) Special Item Charges Debt Extinguishment Costs Before Tax Special Item Charges Debt Extinguishment Costs Before Tax Undiscounted expected future policy benefits Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance Schedule of Investments [Table] Schedule of Investments [Table] Other long-term investments Other Long-Term Investments Dividends Payable, Date of Record Dividends Payable, Date of Record Divestitures, net of cash sold Proceeds from Divestiture of Businesses, Net of Cash Divested Other (primarily short-term and other long-term investments) Payments to Acquire Other Investments Postretirement benefits liability Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Outstanding payment obligations, current, voluntarily elected by suppliers to be sold to the financial institution Supplier Finance Program, Outstanding Payment Obligation, Current, Voluntarily Elected To Be Sold Supplier Finance Program, Outstanding Payment Obligation, Current, Voluntarily Elected To Be Sold Debt securities Debt Securities [Member] Asset Class [Domain] Asset Class [Domain] Fair Value of Collateral Contractually Required to Meet or Exceed Carrying Value of Recoverable Ceded Credit Risk, Secured, Contractually Required Fair Value [Member] Ceded Credit Risk, Secured, Contractually Required Fair Value Secured Ceded Credit Risk, Secured [Member] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Total shares Weighted Average Number of Shares Outstanding, Diluted Changes due to expected run-off Market Risk Benefit, Increase (Decrease) Due to Expected Run-Off Market Risk Benefit, Increase (Decrease) Due to Expected Run-Off Entity Emerging Growth Company Entity Emerging Growth Company U.S. Healthcare United States Healthcare [Member] United States Healthcare Liquidity Measurement Input, Liquidity [Member] Measurement Input, Liquidity Reinsurance Recoverables Ceded Credit Risk [Table Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Life and annuity insurance products Life and Annuity Insurance Product Line [Member] Property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Commercial Paper Commercial Paper [Member] Liability for guarantees Guarantor Obligations, Current Carrying Value Carrying Value Information for Other Long-Term Investments Schedule Of Other Long-Term Investments [Table Text Block] Schedule Of Other Long-Term Investments (Gain) on sale of businesses, after-tax Special Item, Gain (Loss) On Sale Of Business, Net Of Tax Special Item, Gain (Loss) On Sale Of Business, Net Of Tax Pre-tax Special items Special Items Before Tax [Abstract] Asset impairments Asset Impairments [Member] Asset Impairments Equity Security Investments Equity Securities, FV-NI And Equity Securities Without Readily Determinable Fair Value [Table Text Block] Equity Securities, FV-NI And Equity Securities Without Readily Determinable Fair Value Total capacity, uncommitted factoring facilities Accounts Receivable, Uncommitted Factoring Facilities, Total Capacity Total amount of certain accounts receivable that may be sold on a non-recourse basis to a financial institution under uncommitted accounts receivable factoring facilities. Treasury Stock Treasury Stock, Common [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Policyholder Account Balance, Above Guaranteed Minimum Crediting Rate, Based On Greater Of Guaranteed Minimum Cash Value Or Actual Cash Value Policyholder Account Balance, Above Guaranteed Minimum Crediting Rate, Based On Greater Of Guaranteed Minimum Cash Value Or Actual Cash Value [Member] Policyholder Account Balance, Above Guaranteed Minimum Crediting Rate, Based On Greater Of Guaranteed Minimum Cash Value Or Actual Cash Value Noncatastrophic Event [Domain] Noncatastrophic Event [Domain] 1.250% Notes due March 2026 Notes due 2026, 1.25% [Member] Notes payable bearing interest at 1.25% due in 2026. All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Shields Health Solutions Shields Health Solutions [Member] Shields Health Solutions Impairment of dividend receivable, after-tax Special Items. Increase (Decrease) To Revenues After Tax Special Items. Increase (Decrease) To Revenues After Tax Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Information Segment Reporting [Text Block] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Redemption price discount, spread on variable rate Debt Instrument, Redemption Price, Discount, Spread On US Treasury Rate Basis points added to the most directly comparable U.S. Treasury rate to calculate a "make whole" premium for debt redemptions. Liabilities Liabilities [Abstract] Shares: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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] Derivatives Derivative [Member] Repayment of term loan Repayments of Notes Payable Common stock, shares authorized Common Stock, Shares Authorized Debt securities and equity securities Proceeds From Maturities Prepayments And Calls Of Debt And Equity Securities Proceeds from maturities, repayments and calls of debt and equity securities. Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Restructuring Cost [Table] Restructuring Cost [Table] Recurring Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Contractholder deposit funds not reinsured externally, percent with guaranteed interest rates of 0300 to 0400 Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Percentage Percentage of policyholder account balance representing contract with guaranteed interest rates of 3%-4%. Document Quarterly Report Document Quarterly Report 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] State and local government US States and Political Subdivisions Debt Securities [Member] Effect of foreign currency rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Derivative Measurement Input Derivative Asset (Liability) Net, Measurement Input Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Repayment of long-term debt Repayment of long-term debt Repayments of Long-Term Debt Unpaid claims and claim expenses, non-current Liability For Claims And Claims Adjustment Expense, Noncurrent Liability For Claims And Claims Adjustment Expense, Noncurrent Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Restructuring Reserve, Beginning Balance Restructuring Reserve, Ending Balance Restructuring Reserve Equity Component [Domain] Equity Component [Domain] (Losses) gains included in Shareholders' net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Benefits and expenses Benefits, Losses and Expenses [Abstract] Adoption Date Trading Arrangement Adoption Date Inventories Inventory, Policy [Policy Text Block] Current Short-Term Investments [Abstract] Automatic renewal term, uncommitted factoring facilities (in years) Accounts Receivable, Uncommitted Factoring Facilities, Automatic Renewal Term Automatic renewal term for uncommitted Accounts receivable factoring facilities. Restructuring Type [Axis] Restructuring Type [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Risk corridors recovery, after-tax Special Item, Gain (Loss) On Risk Corridor Allowance Adjustment, Net Of Tax Special Item, Gain (Loss) On Risk Corridor Allowance Adjustment, Net Of Tax Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Summary of Market Risk Benefit Market Risk Benefit, Activity [Table Text Block] Other, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Incurred and Paid Claims Development Short-Duration Insurance Contracts, Claims Development [Table Text Block] R2026Q2 Dividends [Member] R2026Q2 Dividends [Member] R2026Q2 Dividends Commercial Portfolio Segment Commercial Portfolio Segment [Member] Other sales, maturities and repayments (primarily short-term and other long-term investments) Proceeds from Sale and Maturity of Other Investments Selling, general and administrative expenses Selling, General and Administrative Expense Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Type of Restructuring [Domain] Type of Restructuring [Domain] Account Value, Net Amount at Risk and the Number of Contractholders for Guarantees Assumed in the Event of Death Schedule of Net Amount of Risk by Product and Guarantee [Table Text Block] Contingencies and Other Matters Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] A- equivalent and higher current ratings Nationally Recognized Statisical Rating Organizations (NRSRO), A- Or Higher [Member] Nationally Recognized Statisical Rating Organizations (NRSRO), A- Or Higher Outstanding Employee Stock Options Not Included in the Computation of Diluted Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Weighted Average Weighted Average [Member] Employee severance, asset impairments and other Employee Severance And Other Restructuring [Member] Employee Severance And Other Restructuring All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Income Taxes Income Tax, Policy [Policy Text Block] NET CASH PROVIDED BY OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Total liability for future policy benefits Liability for Future Policy Benefit, before Reinsurance Prior years Favorable (unfavorable) variance, amount Prior Year Claims and Claims Adjustment Expense Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Weighted average duration Liability for Future Policy Benefit, Weighted-Average Duration Restructuring Plan [Domain] Restructuring Plan [Domain] Intersegment Eliminations Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total reinsurance recoverables Reinsurance Recoverables, Including Reinsurance Premium Paid Separate account liabilities Separate Account, Liability City Area Code City Area Code Name Forgone Recovery, Individual Name Revolving Credit Agreement, April 2025 Revolving Credit Agreement April 2025 [Member] Revolving credit agreement entered in April 2025 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Net proceeds Proceeds From Issuance Of Long-term Debt, Net Of Discounts And Underwriting Fees Proceeds From Issuance Of Long-term Debt, Net Of Discounts And Underwriting Fees Pre-tax adjusted income (loss) from operations Pre-tax adjusted income (loss) from operations Adjusted Income (Loss) From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Aggregate amount of options to increase commitments Line Of Credit Facility, Accordion Feature, Incremental Increase In Maximum Borrowing Capacity Line Of Credit Facility, Accordion Feature, Incremental Increase In Maximum Borrowing Capacity Policyholder Account Balance [Table] Policyholder Account Balance [Table] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Medicare Advantage and related Cigna Healthcare businesses Medicare Advantage And Related Cigna Healthcare Businesses [Member] Medicare Advantage And Related Cigna Healthcare Businesses Beginning balance, including held for sale assets Ending balance, including held for sale assets Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value Before Reclassification To Disposal Group Assets Held For Sale Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value Before Reclassification To Disposal Group Assets Held For Sale Guaranteed minimum credit rating Policyholder Account Balance, Guaranteed Minimum Credit Rating Accrued expenses and other liabilities Accrued Expenses And Other Liabilities Carrying value as of the balance sheet date of other current liabilities and obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Home delivery and specialty revenues Home Delivery And Specialty [Member] Description of Business Nature of Operations [Text Block] Number of Issues Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Measurement Basis [Axis] Measurement Basis [Axis] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Total investments Total investments Investments Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] AOCI Stockholders' Equity, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Fair Value and Significant Unobservable Inputs Used in Pricing Debt Securities Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status NET CASH USED IN FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Senior Notes Issued September 2025 Senior Notes Issued September 2025 [Member] Senior Notes Issued September 2025 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] Annuitization election period Annuitization Election Period The period of time prior to a policy anniversary when an annuitization election must occur. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Changes due to capital markets versus expected Market Risk Benefit, Increase (Decrease) From Interest Rate Change And Equity Market Change Market Risk Benefit, Increase (Decrease) From Interest Rate Change And Equity Market Change Net Investment Income [Line Items] Net Investment Income [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Other Comprehensive Income (Loss), Tax [Abstract] Other Comprehensive Income (Loss), Tax [Abstract] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 [Member] Derivative assets Derivative Asset Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Subsegments [Axis] Subsegments [Axis] Preferred Stock Preferred Stock [Member] Berkshire Hathway Life Insurance Company Of Nebraska Berkshire Hathway Life Insurance Company Of Nebraska [Member] Berkshire Hathway Life Insurance Company Of Nebraska Other, net Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Carrying Value Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Carrying Amount, Before Reclassification To Disposal Group, Assets Held For Sale [Abstract] Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Carrying Amount, Before Reclassification To Disposal Group, Assets Held For Sale Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Financial Assets and Financial Liabilities Carried at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] allowances Allowance For Receivables Current Amount of allowance for receivables, classified as current. Current Fiscal Year End Date Current Fiscal Year End Date Current discount rate Liability for Future Policy Benefit, Current Weighted-Average Discount Rate Gain on sale of businesses Gain on sale of businesses Gain (Loss) on Disposition of Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Employer insured Employer Insured [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] 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] Change in instrument-specific credit risk for market risk benefits AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent [Member] Common dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Effect of issuing stock for employee benefit plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Financial and performance guarantees Guarantee Obligations [Member] Accounts receivable sold that remain outstanding, uncommitted factoring facilities Accounts Receivable, Uncommitted Factoring Facilities, Accounts Receivable Sold That Remain Outstanding Amount, as of the reporting date, of receivables sold to a financial institution under uncommitted Accounts receivable factoring facilities that have not been collected from the manufacturers and have been removed from the Balance Sheet. Insurance and Contractholder Liabilities Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Unobservable Adjustment Debt Securities, Available-for-Sale, Measurement Input Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Total Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Total [Abstract] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Total Shares of common stock held in treasury Treasury Stock, Common, Shares Premiums Premiums Earned, Net Equity Components [Axis] Equity Components [Axis] Net translation (losses) gains on foreign currencies Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Including Temporary Equity Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Including Temporary Equity Separate Account Asset Category [Domain] Separate Account Asset Category [Domain] Entity Interactive Data Current Entity Interactive Data Current Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest 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 Entity Small Business Entity Small Business Unearned premiums Unearned Premiums SHAREHOLDERS' COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Cigna Healthcare Health Care [Member] Other assets Other Assets, Noncurrent Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Net change in short-term debt Proceeds From (Repayments Of) Other Short-Term Debt Amount of cash outflow for principal payment on finance lease and the net proceeds from (repayments of) short-term debt, defined as borrowing having initial term of repayment of one year or less. Debt extinguishment (gain) costs Debt extinguishment (gain) costs Gain (Loss) on Extinguishment of Debt Investment Income And Gains And Losses [Abstract] Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Collateral provisions exist that may mitigate risk of credit loss Ceded Credit Risk, Secured, Collateral Provisions Exist That May Mitigate Risk [Member] Ceded Credit Risk, Secured, Collateral Provisions Exist That May Mitigate Risk Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Proceeds from investments sold: Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Net proceeds on issuance of long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Evernorth Health Services Evernorth [Member] Health Services includes pharmacy benefits management (PBM), pharmacy home delivery, and certain medical management services. This segment includes Express Scripts business from the date of acquisition with the exception of Express Scripts Medicare Part D business that is reported in the Government operating segment. Accounts receivable sold, uncommitted factoring facilities Accounts Receivable, Uncommitted Factoring Facilities, Amount Sold Amount of receivables sold to a financial institution under uncommitted Accounts receivable factoring facilities during the period. Short-term investments Other Short-Term Investments Net Investment Hedging Net Investment Hedging [Member] Not rated Nationally Recognized Statisical Rating Organizations (NRSRO), Not Rated [Member] Nationally Recognized Statisical Rating Organizations (NRSRO), Not Rated Greater than 100% Ltv Greater Than 100 Percent [Member] Debt-to-value ratio greater than 100 percent. Element name an standard label in DTV [numeric lower end] to [numeric higher end] Percent [Member] format. Payments for debt extinguishment Payment for Debt Extinguishment or Debt Prepayment Cost Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Contingencies — Note 14 Commitments and Contingencies Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Contractholder deposit funds not reinsured externally Policyholder Account Balance Executive Category: Executive Category [Axis] Net unrealized appreciation on securities and derivatives Other Comprehensive Income (Loss), Available-For-Sale Securities And Derivatives Adjustment, Net Of Tax Other Comprehensive Income (Loss), Available-For-Sale Securities And Derivatives Adjustment, Net Of Tax Impairment of dividend receivable Special item related to impairment of dividend receivable Impairment of dividend receivable Special Items. Increase (Decrease) To Revenues Special Items. Increase (Decrease) To Revenues Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Tax Reinsurance Reinsurance [Text Block] Investments including held for sale assets Investments Before Reclassification To Disposal Group Assets Held For Sale Investments Before Reclassification To Disposal Group Assets Held For Sale Inventories Inventory, Net Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Derivative gain (loss) reclassified from other comprehensive income into shareholders' net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Supplemental Disclosure of Cash Information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Total paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Investments including held for sale assets Short Term Investments Before Reclassification To Disposal Group Assets Held For Sale Short Term Investments Before Reclassification To Disposal Group Assets Held For Sale Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Revenue Recognition Revenue [Policy Text Block] Initial term, uncommitted factoring facility (in years) Accounts Receivable, Uncommitted Factoring Facility, Initial Term Initial term length for uncommitted Accounts receivable factoring facility. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Reinsurance recoverables Reinsurance Recoverables, Noncurrent Amount, after valuation allowance, recoverable after one year under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 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] Average Loan-to-Value Ratio Financing Receivable Credit Quality Loan To Value Ratio Financing Receivable Credit Quality Loan To Value Ratio Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Retiree and Life Insurance Benefits Retirement And Life Insurance Contracts [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Cash surrender value Policyholder Account Balance, Cash Surrender Value Basic (in dollars per share) Earnings per share, basic Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Total current assets Assets, Current Insider Trading Arrangements [Line Items] Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block] Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3, by class of assets and liabilities. 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] Market risk benefits, current Market Risk Benefit, Liability, Amount, Current Market Risk Benefit, Liability, Amount, Current Balance Balance Temporary Equity, Including Noncontrolling Interest Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Insurance [Abstract] Future policy benefits, non-current Liability For Future Policy Benefit, Before Reinsurance, Noncurrent Liability For Future Policy Benefit, Before Reinsurance, Noncurrent Trading Arrangement, Common Stock [Member] Trading Arrangement, Common Stock Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Concentration percentage Concentration Risk, Percentage Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Investments classified as assets of business held for sale Disposal Group Including Discontinued Operation, Current Investments, Current Disposal Group Including Discontinued Operation, Current Investments, Current Short-term debt Debt, Current Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Net Amount at Risk, by Product and Guarantee [Table] Net Amount at Risk, by Product and Guarantee [Table] Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] The Lincoln National Life Insurance Company And Lincoln Life And Annuity Of New York The Lincoln National Life Insurance Company And Lincoln Life And Annuity Of New York [Member] Reinsurance recoverables resulting from the 1998 sale of the Companys individual life insurance and annuity business. Insurance and Contractholder Liabilities Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Interest expense and other Other Nonoperating Income (Expense) Separate Account Assets Separate Account Assets [Member] A separate investment account established and maintained by an insurance entity under relevant state insurance law to which funds have been allocated for certain contracts of the insurance entity. Funds in a separate account are not commingled with other assets of the insurance entity for investment purposes. Other debt securities Other Debt Obligations [Member] Shareholders' Equity Parent [Member] Short-term investments Short-Term Investments [Member] Shareholders' equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Cigna Healthcare Cigna Healthcare [Member] Cigna Healthcare Accounts receivable, net Total Receivables, Net, Current Percentage with cash values at more than 110% of guaranteed cash value Policyholder Account Balance, Percentage With Cash Values At More Than 110 Percent Of Guaranteed Cash Value Policyholder Account Balance, Percentage With Cash Values At More Than 110 Percent Of Guaranteed Cash Value Hedging Designation [Domain] Hedging Designation [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Amortized Cost Transfers into / (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Investments Investment, Policy [Policy Text Block] Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Less Than 12 Months, Amortized Cost Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Less Than 12 Months, Amortized Cost Investment income Interest And Dividend Income Operating And Operating Leases Income Statement Lease Revenue Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. Also includes the total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Other Other Healthcare [Member] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) [Domain] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) [Domain] Credit Rating, Nationally Recognized Statistical Rating Organization (NRSRO) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Investments Current investments Short-Term Investments Dividends [Axis] Dividends [Axis] Currency Swap Currency Swap [Member] Deposits and interest credited to contractholder deposit funds Additions to Contract Holders Funds Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Income distributions Proceeds from Equity Method Investment, Distribution International Health International Health [Member] International Health Investments, Debt and Equity Securities [Abstract] contractual allowances for certain pharmaceutical manufacturers rebate receivables Contractual Allowance, Pharmaceutical Manufacturers Receivables Amount of contractual allowances for certain rebates receivables with pharmaceutical manufacturers, classified as current. Change in unrealized gain or (loss) included in Other comprehensive loss for assets held at the end of the reporting period Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Medical cost trend Medical Cost Trend [Member] Amounts relating to actual claims emerging differently from assumptions about the level of claims per member used to set reserves. Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At 200 Percent Target Level [Member] Trading Arrangement, Common Stock Issuable Upon Vesting Of Performance Award At 200 Percent Target Level Other transactions impacting noncontrolling interests Temporary Equity, Other Changes Derivative liabilities Derivative Liability Senior Notes Senior Notes [Member] Translation of Foreign Currencies Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One TOTAL BENEFITS AND EXPENSES Benefits, Losses and Expenses TOTAL INCOME TAXES Income Tax Expense (Benefit) Fair Value Hedging Fair Value Hedging [Member] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Trading Arrangement, Stock Options [Member] Trading Arrangement, Stock Options Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Commercial mortgage loans Proceeds from Collection of Loans Receivable Statement [Table] Statement [Table] Contractholder deposit funds, non-current Policyholder Contract Deposit, Noncurrent Policyholder Contract Deposit, Noncurrent Total Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Carrying Amount Equity Securities, FV-NI And Without Readily Determinable Fair Value, And Hybrid Instruments, Carrying Amount Contractholder deposit fund liabilities, approximate percent reinsured externally Policyholder Contract Balance, Percent Reinsured Externally Policyholder Contract Balance, Percent Reinsured Externally Unearned premiums, current Unearned Premiums, Current Unearned Premiums, Current Unpaid Claims and Claims Expenses Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] 4.875% Notes due September 2032 $1,250 million, 4.875% Notes Due September 2032 [Member] $1,250 million, 4.875% Notes Due September 2032 Other long-term investments Other long-term investments Other Long-Term Investments [Member]