Beginning balance Ending balance Benefits and Expenses Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Loan-to-Value Ratio: Credit Ratings: Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract] Impact of interest from derivatives associated with notes payable Gain (Loss) On Change In Fair Value Of Derivative, Interest Rate Component, Operating Gain (loss) on change in fair value of derivative, interest rate component, considered an operating gain (loss) when analyzing segment operations Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Stockholders Equity Note [Line Items] Other policyholders’ funds Other Policyholder Funds Hospitality Hotel [Member] Proceeds from borrowings Proceeds from Issuance of Long-Term Debt and Capital Securities, Net Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Available-for-Sale Securities Debt Securities, Available-for-Sale [Table Text Block] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Award Timing Predetermined Award Timing Predetermined [Flag] 6.90% senior notes due December 2039 Senior Notes Six Point Nine Zero Percent Due December Twenty Thirty Nine [Member] Senior Notes Six Point Nine Zero Percent Due December Twenty Thirty Nine [Member] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Lease obligations Lease Obligation Incurred Securities lending, cash collateral, not offset in balance sheet Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Tabular List, Table Tabular List [Table Text Block] Income tax expense (benefit) related to items of other comprehensive income (loss) Other Comprehensive Income (Loss), Tax Other dispositions Stock Issued During Period, Shares, Other $400 million line of credit (Aflac Incorporated as borrower) Four hundred million dollar line of credit (Aflac Incorporated as borrower) [Member] Four hundred million dollar line of credit (Aflac Incorporated as borrower) New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Total Financing Receivable, Allowance for Credit Loss, Writeoff Fair Value Hierarchy, Assets and Liabilities Not Carried at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Foreign currency translation and other Policyholder Account Balance, Foreign Currency Translation and Other Policyholder Account Balance, Foreign Currency Translation and Other Fixed maturity securities Debt Securities [Member] Commercial mortgage and other loans Proceeds from Sale and Collection of Loans Receivable Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Summary of Net Earned Premiums Recognized Summary of Net Earned Premiums Recognized [Table Text Block] Summary of Net Earned Premiums Recognized Outsourcing agreement, remaining term Long-Term Purchase Commitment, Period Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Banks/financial institutions Banks And Financial Institutions [Member] Banks and Financial Institutions Middle market loans Middle market loans [Member] Middle market loans [Member] Non-derivative hedging instruments Non-derivative Hedging Instruments [Member] Non-derivative Hedging Instruments [Member] Interest accrual Liability for Future Policy Benefit, Expected Net Premium, Interest Income Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration Risk, Percentage Concentration Risk, Percentage Pension Plan Pension Plan [Member] 1.600% senior notes due March 2034 Senior Notes One Point Six Zero Zero Percent Due March Twenty Thirty Four [Member] Senior Notes One Point Six Zero Zero Percent Due March Twenty Thirty Four Amortized hedge income Derivative, Cash Received on Hedge Employee Stock Option Share-Based Payment Arrangement, Option [Member] Commercial mortgage and other loans Total net commercial mortgage and other loans Financing Receivable, after Allowance for Credit Loss .750% senior notes due March 2032 Senior Notes Point Seven Five Zero Percent Due March Twenty Thirty Two [Member] Yen-denominated senior notes .750% due March 2032 Grantee Status [Domain] Grantee Status [Domain] Dividends to shareholders Dividends, Common Stock, Cash Total shareholders’ equity Balance, beginning of period Balance, end of period Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Current-period gross writeoffs: Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Fixed maturity securities held to maturity (Addition to) release of allowance for credit losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) Liabilities and shareholders’ equity: Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Year of Origination [Axis] Year of Origination [Axis] Year of Origination [Axis] Measurement Basis Portion at Fair Value Measurement [Member] Change in investment-type contracts, net Net Change Annuities and Investment Certificates Upper Limit Maximum [Member] Potential Foreclosure or Deed-in-lieu Foreclosure Potential Foreclosure or Deed-in-lieu Foreclosure [Member] Potential Foreclosure or Deed-in-lieu Foreclosure Noncash real estate acquired in satisfaction of debt Real Estate Owned, Transfer to Real Estate Owned Options Exercisable - Weighted-Average Exercise Price Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Effect of changes in discount rate assumptions AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax Share repurchase program, remaining authorized, number of shares Share Repurchase Program, Remaining Authorized, Number of Shares Total Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted Stock Restricted Stock [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Earned premiums, direct Direct Premiums Earned Loan modification, deferral period, duration Financing Receivable, Modified, Payment Deferral, Period, Duration Financing Receivable, Modified, Payment Deferral, Period, Duration Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount 2023 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loan modification, term extension Financing Receivable, Modified, Weighted Average Term Increase from Modification Earnings before income taxes Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] 1.125% senior sustainability notes paid March 2026 Senior Notes One Point One Two Five percent Paid March Twenty Twenty Six [Member] Senior Sustainability Notes One Point One Two Five percent Paid March Twenty Twenty Six Net liability for future policy benefits after reinsurance recoverable Liability for Future Policy Benefit, after Reinsurance Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] 2.779% senior notes due June 2040 Senior Notes Two Point Seven Seven Nine Percent Due June Twenty Fourty [Member] Senior Notes Two Point Seven Seven Nine Percent Due June Twenty Fourty Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Interest expense Interest Expense, Operating Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One $2 million line of credit Two million dollar line of credit [Member] Two million dollar line of credit Deferred Policy Acquisition Cost [Line Items] Deferred Policy Acquisition Cost [Line Items] Loan modification, percent of total amortized cost Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Offsetting Liabilities [Table] Offsetting Liabilities [Table] Texas TEXAS Maximum length of time hedged in cash flow hedge Maximum Length of Time Hedged in Cash Flow Hedge 2023 Originated Three Years before Latest Fiscal Year [Member] Originated Three Years before Latest Fiscal Year [Member] Document Fiscal Period Focus Document Fiscal Period Focus Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Award Type [Axis] Award Type [Axis] Unrealized Foreign Currency Translation Gains (Losses) Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] 1.488% senior notes due October 2033 Senior Notes One Point Four Eight Eight Percent Due October Twenty Thirty Three [Member] Senior Notes One Point Four Eight Eight Percent Due October Twenty Thirty Three Trading Symbol Trading Symbol Benefits and claims, excluding reserve remeasurement, direct Policyholder Benefits and Claims Incurred, Direct Exercise of stock options and issuance of restricted shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Foreign currency translation and other Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other Entity Emerging Growth Company Entity Emerging Growth Company Held-to-Maturity Securities Debt Securities, Held-to-Maturity [Table Text Block] Derivative, collateral, right to reclaim cash Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Options Outstanding - Stock Option Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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 foreign exchange Debt Securities, Available-for-Sale, Allowance for Credit Loss, Foreign Currency Translation Amount of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on debt securities, available-for-sale. Summary of Interest Expense Related to Insurance Contracts Recognized Summary of Interest Expense Related to Insurance Contracts Recognized [Table Text Block] Summary of Interest Expense Related to Insurance Contracts Recognized Gains (losses) recognized in income on derivative Derivative, Gain (Loss) on Derivative, Net Derivatives and other Derivatives and other [Member] Derivatives and other [Member] Securities lending, carrying value of financial instruments not offset in balance sheet Security Borrowed, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Shares outstanding, end of period Common Stock, Shares, Outstanding Fixed maturity securities, held-to-maturity Total fixed maturity securities, held-to-maturity, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss Gross Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Benefits and Expenses Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance Schedule of Common Stock Outstanding Roll Forward Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Zero-credit-loss expectation Financial Asset Acquired and No Credit Deterioration [Member] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised 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] 2026 Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Due after one year through five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income taxes Income tax (expense) or benefit Income Tax Expense (Benefit) Commercial mortgage and other loans Payments to Acquire Loans Receivable Costs of investments acquired: Payments to Acquire Investments [Abstract] Loan to Value Ratio, 60.00% to 69.99% Loan to Value Ratio, Sixty to Sixty-nine Point Nine-Nine Percent [Member] Loan to Value Ratio, Sixty to Sixty-nine Point Nine-Nine Percent [Member] Other Other Assets Interest credited Policyholder Account Balance, Interest Expense Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Ceded reinsurance, amount of reserves transferred Coinsurance, Amount of Reserves Transferred Coinsurance, Amount of Reserves Transferred Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Unrealized gains (losses) on derivatives during period, net of income taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Long-Term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Due in one year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Unrealized gains (losses) on fixed maturity securities AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Notes payable Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosure [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Proceeds from stock options exercised Proceeds from Stock Options Exercised 1.075% senior notes due September 2029 Senior Notes One Point Zero Seven Five Percent Due September Twenty Twenty Nine [Member] Senior Notes One Point Zero Seven Five Percent Due September Twenty Twenty Nine All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] CCC Credit Rating CCC Credit Rating [Member] CCC Credit Rating [Member] Beginning Balance Ending Balance Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Aflac Life Insurance Japan (ALIJ) Aflac Life Insurance Japan (ALIJ) [Member] Aflac Life Insurance Japan (ALIJ) Beginning balance at original discount rate Ending balance at original discount rate Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance Securities lending transactions Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred Net cash provided (used) by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Line of credit facility, term Senior note facility agreement, term Debt Instrument, Term Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Other Investments [Abstract] Other Investments [Abstract] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Real estate owned, depreciation expense Depreciation Amortized Cost Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Gross amount of recognized derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Allowance for Loan Losses by Portfolio Segment Loans and Leases Receivable Disclosure [Table] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Carrying value of financial instruments, liabilities not offset in balance sheet Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Investments and cash: Investments and Cash [Abstract] Number of reportable insurance business segments Number of Reportable Segments 1.412% senior notes due March 2031 Senior Notes One Point Four One Two Percent Due March Twenty Thirty One [Member] Senior Notes One Point Four One Two Percent Due March Twenty Thirty One Middle market loan commitments Middle Market Loan Commitments Middle Market Loan Commitments Treasury stock reissued Stock Issued During Period, Value, Treasury Stock Reissued Total benefits and claims, net Total benefits and claims, net Policyholder Benefits and Claims Incurred, Net Entity Address, State or Province Entity Address, State or Province Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Debt instrument, unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Cancer Cancer [Member] Cancer [Member] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Individual: Individual [Axis] Sovereign and supranational Sovereign Debt [Member] Share-based compensation grants Share Based Compensation Grants [Member] Share Based Compensation Grants [Member] Loan Performance After Modifications Financing Receivable, Modified, Past Due [Table Text Block] Other Other Insurance [Member] Other Insurance Reinsurer, Other Reinsurer, Other [Member] Mortgage- and asset-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Principal forgiveness Principal Forgiveness [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 2023 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Entity Interactive Data Current Entity Interactive Data Current 2024 Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Offered quotes Measurement Input, Offered Price [Member] Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Unrealized foreign currency translation gains (losses) during period Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax 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] Options Exercisable - Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Stock Options Outstanding and Exercisable Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] $15 million line of credit Fifteen million dollar line of credit [Member] $15 million line of credit Other-than-insignificant payment delays Payment Deferral [Member] Fixed Annuity Fixed Annuity [Member] 2026 Financing Receivable, Year One, Originated, Current Fiscal Year Revolving Loans Financing Receivable, Revolving Proceeds from investments sold or matured: Proceeds from Sale, Maturity and Collection of Investments [Abstract] (Addition to) release of allowance for credit losses Financing Receivable and Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) Financing Receivable and Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) Ceded reinsurance, percentage Reinsurance, Reinsured Risk, Percentage Entity Central Index Key Entity Central Index Key Capitalization Deferred Policy Acquisition Cost, Capitalization PEO Name PEO Name Unrealized foreign currency translation gains (losses) Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Total revenues Total revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Foreign currency swaps Currency Swap [Member] Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Office Office Building [Member] Share-based compensation arrangement by share-based payment award, maximum number of shares issuable other than options and stock appreciation rights Share-based Compensation Arrangement by Share-based Payment Award, Shares that May be Awarded Other than Stock Options or Stock Appreciation Rights Share-based Compensation Arrangement by Share-based Payment Award, Shares that May be Awarded Other than Stock Options or Stock Appreciation Rights Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Net amounts of assets presented in balance sheet Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Gross amounts of recognized financial instruments, offsetting liabilities Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross Including Not Subject to Master Netting Arrangement Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Assets/(Liabilities) Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Vesting [Domain] Vesting [Domain] Commercial mortgage and other loans, gross Total Total Financing Receivable, before Allowance for Credit Loss Debt-to-Value [Domain] Debt-to-Value [Domain] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total fixed maturity securities, available-for-sale, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss Total benefits and expenses Total benefits and expenses Benefits, Losses and Expenses Entity Address, Address Line One Entity Address, Address Line One Effect of changes in discount rate assumptions during period, net of income taxes OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Investments [Domain] Investments [Domain] Treasury stock issued Stock Issued Deferred income taxes Accumulated other comprehensive income loss deferred income tax on investment securities Accumulated other comprehensive income loss, deferred income tax on investment securities. Federal historic rehabilitation and solar tax credits, amount Federal Historic Rehabilitation and Solar Tax Credits, Amount Amount of federal historic rehabilitation and solar tax credits recognized. Allowance for Credit Losses by Portfolio Segment [Line Items] Loans and Leases Receivable Disclosure [Line Items] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] BB Credit Rating BB Credit Rating [Member] BB Credit Rating Fair Value as of Grant Date Award Grant Date Fair Value $300 thousand line of credit Three hundred thousand dollar line of credit [Member] $300 thousand line of credit Reconciliation of Adjusted Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] 1.750% senior notes due October 2038 Senior Notes One Point Seven Five Zero Percent Due October Twenty Thirty Eight [Member] Senior Notes One Point Seven Five Zero Percent Due October Twenty Thirty Eight Weighted-average interest, current discount rate Liability for Future Policy Benefit, Current Weighted-Average Discount Rate Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Schedule of Other Policyholders' Funds by Guaranteed Crediting Rates Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table Text Block] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Granted Restricted stock awards, grants in period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Other loan commitments Other Loans Commitments Other Loans Commitments Total compensation cost not yet recognized, restricted stock awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Canceled Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Gross amounts offset in balance sheet Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Balance, beginning of period Balance, end of period Financing Receivable and Debt Securities, Allowance for Credit Loss Financing Receivable and Debt Securities, Allowance for Credit Loss Reinsurance recoverables and other Reinsurance Recoverable, Credit Loss Expense (Reversal) Change in foreign exchange Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Foreign Currency Translation Amount of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on debt securities, held-to-maturity. Document Quarterly Report Document Quarterly Report Less than 12 months Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Financing Receivable Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Percent of total commercial mortgage and other loans Percent of Loans and Leases Receivable, Gross, Carrying Value Percent of amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Options Outstanding - Weighted-Average Remaining Term (Years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Other Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change Accrued investment income Accrued Investment Income Receivable Assumed reinsurance, amount of reserves assumed Coinsurance, Amount of Reserves Assumed Coinsurance, Amount of Reserves Assumed Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Receivables Premiums and Other Receivables, Net Non-PEO NEO Non-PEO NEO [Member] Options Outstanding - Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Fixed maturity securities, available-for-sale, allowance for credit losses Allowance for Credit Losses Balance, beginning of period Balance, end of period Debt Securities, Available-for-Sale, Allowance for Credit Loss Treasury Stock [Roll Forward] Treasury Stock Issued [Roll Forward] Treasury Stock Issued [Roll Forward] Accumulated Other Comprehensive Income (Loss)[Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Yen-denominated loan variable interest rate due August 2032 Yen-denominated Loan Variable Interest Rate Due August Twenty Thirty Two [Member] Yen-denominated Loan Variable Interest Rate Due August Twenty Thirty Two Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Offsetting Assets Offsetting Assets [Table Text Block] Commercial mortgage and other loans, allowance for credit losses Allowance for credit losses Balance, beginning of period Balance, end of period Allowance for credit losses Financing Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] Pension liability adjustment, prior service (cost) credit Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Other, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other income (loss) Other income Other Income Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair value Estimate of Fair Value Measurement [Member] Offsetting Assets [Table] Offsetting Assets [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Adjusted beginning of period balance Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change Aflac Re Bermuda Aflac Re Bermuda [Member] Aflac Re Bermuda 2.320% senior notes due May 2035 Senior Notes Two Point Three Two Zero Percent Due May Twenty Thirty Five [Member] Senior Notes Two Point Three Two Zero Percent Due May Twenty Thirty Five Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Consensus pricing valuation technique Valuation Technique, Consensus Pricing Model [Member] Net amount of derivative assets presented in balance sheet Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral 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 Securities lending, cash collateral, liabilities not offset in balance sheet Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Third-party pricing vendor Third party pricing vendor valuation technique [Member] Third party pricing vendor valuation technique [Member] Investment Exposures Exceeding Ten Percent Shareholders' Equity Investment Exposures Exceeding 10 Percent Shareholders Equity [Table Text Block] Investment Exposures that Exceeded Ten Percent of Shareholders' Equity Medical and other health Medical And Other Health [Member] Medical and Other Health [Member] Effect of foreign currency translation on after-tax adjusted earnings Effect of foreign currency translation on after tax adjusted earnings Effect of foreign currency translation on after tax adjusted earnings Revenues: Revenues [Abstract] Foreign currency options Foreign Exchange Option [Member] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Due after five years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 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Twenty Nine Insurance and other expenses Selling, General and Administrative Expense Exchange [Domain] Exchange [Domain] Fixed maturity securities, available-for-sale, measurement input Debt Securities, Available-for-Sale, Measurement Input Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other currencies Other Currency [Member] $1.0 billion line of credit One billion dollar line of credit [Member] One billion dollar line of credit [Member] Settlement (gain) loss Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Industrial Industrial Property [Member] Other comprehensive income (loss) before income taxes: Other Comprehensive Income (Loss), before Tax [Abstract] Gross amount of recognized assets Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross Including Not Subject to Master Netting Arrangement Finance lease obligations Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Statement, Business Segments [Axis] Segments [Axis] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] 2.003% senior notes due December 2032 Senior Notes Two Point Zero Zero Three Percent Due December Twenty Thirty Two [Member] Senior Notes Two Point Zero Zero Three Percent Due December Twenty Thirty Two Other, net Payment for (Proceeds from) Other Investing Activity SHARE-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] 1.039% senior notes due April 2036 Senior Notes One Point Zero Three Nine Percent Due April Twenty Thirty Six [Member] Senior Notes One Point Zero Three Nine Percent Due April Twenty Thirty Six Surrenders and withdrawals Policyholder Account Balance, Surrender and Withdrawal Maturity up to 30 Days Maturity Less than 30 Days [Member] Loan modification, after 12 months, nonaccrual Financing Receivable, Modified, after 12 months, Nonaccrual Financing Receivable, Modified, after 12 months, Nonaccrual Assets: Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] 4.750% senior notes due January 2049 Senior Notes Four Point Seven Five Zero Percent Due January Twenty Forty Nine [Member] Senior Notes Four Point Seven Five Zero Percent Due January Twenty Forty Nine Forward bond purchase commitment Other Contract [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 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Debt Instrument, Interest Rate, Stated Percentage Credit spreads Measurement Input, Credit Spread [Member] Credit losses: Allowance for Credit Loss [Abstract] Derivative liability, not subject to master netting arrangement Derivative Liability, Not Subject to Master Netting Arrangement Due after five years through 10 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 $250 million line of credit Two hundred fifty million dollar line of credit [Member] Two hundred fifty million dollar line of credit [Member] Gross amount of recognized derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Financing Receivable, Modified, Commitment to Lend Financing Receivable, Modified, Commitment to Lend Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table] Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table] Entity Registrant Name Entity Registrant Name 1.320% senior notes due December 2032 Senior Notes One Point Three Two Zero Percent Due December Twenty Thirty Two [Member] Senior Notes One Point Three Two Zero Percent Due December Twenty Thirty Two Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Municipalities Municipal Bonds [Member] Other Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change Held to maturity securities transferred to available for sale securities, number of investments Held to Maturity Securities Transferred to Available for Sale Securities Number of Investments Number of investments reclassified during the period from the held-to-maturity portfolio to the available-for-sale portfolio. NEW YORK STOCK EXCHANGE, INC. NEW YORK STOCK EXCHANGE, INC. [Member] Total assets Assets, Fair Value Disclosure Other Financial Instrument, Other [Member] Total credit losses Provision for Loan, Lease, and Other Losses Performance Based Vesting Condition Performance Based Vesting Condition Member Performance-based Vesting Condition Total Past Due Financial Asset, Past Due [Member] Equity securities Payments to Acquire Equity Securities, FV-NI Amortized hedge costs Derivative, Cost of Hedge Interest cost Defined Benefit Plan, Interest Cost Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Derivative liability, fair value, amount offset against collateral, subject to master netting agreement Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Unrealized gains (losses) on fixed maturity securities: OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax [Abstract] Share-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Maturity 30 to 90 Days Maturity 30 to 90 Days [Member] Other, net Proceeds from (Payment for) Other Financing Activity Interest expense on debt Interest Expense, Debt Percentage of target award opportunities Percentage of Target Award Opportunities The percentage of target award opportunities that may be paid out in shares depending on performance results. Amounts reclassified from accumulated other comprehensive income (loss) net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] All Currencies [Domain] All Currencies [Domain] Name Trading Arrangement, Individual Name $25 million line of credit (Aflac Asset Management LLC as borrower) Twenty five million dollar line of credit (Aflac Asset Management as Borrower) [Member] Twenty five million dollar line of credit (Aflac Asset Management as borrower) Unrealized gains (losses) on derivatives during period Gains (losses) recognized in other comprehensive income on derivative Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff Change in foreign exchange Financing Receivable and Debt Securities, Allowance for Credit Loss, Foreign Currency Translation Financing Receivable and Debt Securities, Allowance for Credit Loss, Foreign Currency Translation Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Outsourcing agreement, aggregate remaining cost Long-Term Purchase Commitment, Amount Debt instrument, principal amount Debt Instrument, Face Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Share Repurchases, by Program [Axis] Share Repurchase Program [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name 1.560% senior notes due April 2051 Senior Notes One Point Five Six Zero Percent Due April Twenty Fifty One [Member] Senior Notes One Point Five Six Zero Percent Due April Twenty Fifty One Beginning Balance Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Due after one year through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Unrealized gains (losses) on derivatives AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax Deferred profit liability Deferred Profit Liability - Limited-payment Contracts Deferred Profit Liability - Limited-payment Contracts Accident Accident [Member] Accident Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Government and agencies Government and Agencies Debt Securities [Member] Government and Agencies Debt Securities Effect of changes in discount rate assumptions AOCI, Liability for Future Policy Benefit, after Tax Treasury stock, at average cost Treasury Stock, Value .932% senior notes due January 2027 Senior Notes Point Nine Three Two Percent Due January Twenty Twenty Seven [Member] Yen-denominated senior notes .932% due January 2027 Reserve remeasurement (gains) losses, direct Liability for Future Policy Benefit, Remeasurement Gain (Loss), Direct Liability for Future Policy Benefit, Remeasurement Gain (Loss), Direct AA Credit Rating AA Credit Rating [Member] AA Credit Rating Credit Loss Status [Domain] Credit Loss Status [Domain] Segment [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Fixed maturity securities Fixed Maturities [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Consolidated Entity Excluding Variable Interest Entities (VIE) Consolidated Entity, Excluding Consolidated VIE [Member] Securities lending, gross amounts offset in statement of financial position, offsetting liabilities Security Loaned, Subject to Master Netting Arrangement, Asset Offset Change in foreign exchange Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation Derivatives and other: Derivative Asset [Abstract] Unrealized Gains (Losses) on Fixed Maturity Securities Unrealized gains (losses) on available-for-sale securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Beginning balance Ending balance At Guaranteed Minimum Policyholder Account Balance Derivative, collateral, obligation to return cash Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset (Addition to) release of allowance for credit losses Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Gross amount of assets offset in balance sheet Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Fixed maturity securities available-for-sale Payments to Acquire Debt Securities, Available-for-Sale Remeasurement gain (loss), deferred profit liability for limited-payment contracts Liability for Future Policy Benefit, Remeasurement Gain (Loss), Limited-Payment Contract Critical care Critical Care [Member] Critical Care Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Amortization of deferred policy acquisition costs Amortization expense Deferred Policy Acquisition Costs, Amortization Expense Common stock of $.10 par value. In thousands: authorized 1,900,000 shares in 2026 and 2025; issued 1,358,762 shares in 2026 and 1,357,909 shares in 2025 Common Stock, Value, Issued Net earned premiums, principally supplemental health insurance Net earned premiums Net earned premiums Premiums Earned, Net Share-Based Payment Arrangement, Employee Share-Based Payment Arrangement, Employee [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Commitments and contingent liabilities (Note 13) Commitments and Contingencies OTC- Cleared Exchange Cleared [Member] Commercial mortgage loans Commercial mortgage loans [Member] Commercial mortgage loans [Member] 2025 Originated in Fiscal Year before Latest Fiscal Year [Member] Originated in Fiscal Year before Latest Fiscal Year [Member] Other purchases Other Additions During Period Shares Other additions to number of shares during period. Mortgage Loans in Process of Foreclosure, Amount Mortgage Loans in Process of Foreclosure, Amount Short-term investments Short-Term Investments [Member] Revolving Loans Financing Receivable, Revolving, Writeoff Benefits and claims, excluding reserve remeasurement, ceded Policyholder Benefits and Claims Incurred, Ceded Writeoffs, net of recoveries Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Life insurance Life Insurance Product Line [Member] 6.45% senior notes due August 2040 Senior Notes Six Point Four Five Percent Due August Twenty Forty [Member] Senior Notes Six Point Four Five Percent Due August Twenty Forty [Member] Fixed maturity securities, held-to-maturity, allowance for credit losses Allowance for Credit Losses Balance, beginning of period Balance, 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[Domain] Net investment hedge Net Investment Hedging [Member] Gross losses from sales Debt Securities, Available-for-Sale, Realized Loss Common Stock Issued [Roll Forward] Common Stock Issued [Roll Forward] Common Stock Issued [Roll Forward] All Individuals All Individuals [Member] Deferred reinsurance gain liability Deferred Reinsurance Gain Liability Deferred Reinsurance Gain Liability Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Change in receivables and advance premiums Increase (Decrease) in Receivables Name Forgone Recovery, Individual Name Long-term incentive plan awards, term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period 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] Reclassification Out Of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] 1.740% senior notes due March 2036 Senior Notes One Point Seven Four Zero Percent Due March Twenty Thirty Six [Member] Senior Notes One Point Seven Four Zero Percent Due March Twenty Thirty Six Nonaccrual loans, no allowance Financing Receivable, Nonaccrual, No Allowance .633% senior notes due April 2031 Senior Notes Point Six Three Three Percent Due April Twenty Thirty One [Member] Senior Notes Point Six Three Three Percent Due April Twenty Thirty One Net amounts of financial instruments presented in balance sheet, offsetting liabilities Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Liability for Future Policy Benefit Activity [Table] Liability for Future Policy Benefit Activity [Table] Derivative and non-derivative hedging instruments, gain (loss) recognized in other comprehensive income, before tax Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Gross gains (losses) from sales and redemptions Gain (Loss) on Sale of Other Investments Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Transaction Type [Axis] Transaction Type [Axis] Financing Receivable, Modified, Past Due [Line Items] Financing Receivable, Modified, Past Due [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Stockholders Equity Note [Table] Stockholders Equity Note [Table] Stockholders Equity Note [Table] 2.650% senior notes due May 2040 Senior Notes Two Point Six Five Zero Percent Due May Twenty Fourty [Member] Senior Notes Two Point Six Five Zero Percent Due May Twenty Fourty Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Weighted-average interest, original discount rate Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate Policy liabilities: Policy liabilities [Abstract] Policy liabilities [Abstract] Fair Value, Assets, Securities Carried At Fair Value, Primary Pricing Sources Fair Value Assets Securities Carried At Fair Value Primary Pricing Sources [Table Text Block] Fair Value Assets Securities Carried At Fair Value Primary Pricing Sources Financing Receivable, Modified, Past Due [Table] Financing Receivable, Modified, Past Due [Table] Investments, Unrealized Loss Position [Table] Debt Securities, 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Twenty Twenty Seven SHAREHOLDERS' EQUITY Equity [Text Block] 2022 Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Real estate owned, estimated fair value after impairment Real Estate Owned, Fair Value Disclosure Real Estate Owned, Fair Value Disclosure 2024 Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year REINSURANCE Reinsurance [Text Block] Net earnings Net earnings Net of tax Net Income (Loss) Attributable to Parent $25 million line of credit (Aflac New York as borrower) Twenty five million dollar line of credit (Aflac New York as borrower) [Member] $25 million line of credit Long-term incentive plan awards, vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Future policy benefits Net liability for future policy benefits Liability for Future Policy Benefit, before 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[Extensible Enumeration] Investment, Type [Extensible Enumeration] Benefits and claims, excluding reserve remeasurement, assumed Policyholder Benefits and Claims Incurred, Assumed Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Interest expense Liability for Future Policy Benefit, Interest Expense Adjusted cost valuation technique Valuation, Cost Approach [Member] Derivative liability, fair value, amount not offset against collateral Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Amendment Flag Amendment Flag Available-for-sale, fair value: Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Share-based compensation arrangement by share-based payment award, maximum number of shares issuable Share-Based 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Foreign currency gains (losses) Realized Gain (Loss), Foreign Currency Transaction, before Tax Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Loan modification, principal forgiven Financing Receivable, Modified, Increase (Decrease) from Modification Options Exercisable - Stock Option Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Derivative Asset, Fair Value Derivative asset, fair value, gross asset including not subject to master netting arrangement Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Type of Credit Rating [Domain] Type of Credit Rating [Domain] Type of Credit Rating [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] BBB Credit Rating BBB Credit Rating [Member] BBB Credit Rating Debt Disclosure [Abstract] Debt Disclosure [Abstract] Share-Based Payment Arrangement, Nonemployee Share-Based Payment Arrangement, Nonemployee [Member] Dental/vision Dental/Vision [Member] Dental/Vision Gross Premiums Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance Guaranteed Minimum Crediting Rates Policyholder Account Balance, Guaranteed Minimum Credit Rating 2.108% subordinated notes due October 2047 Subordinated Notes Two Point One Zero Eight Percent Due October Twenty Forty Seven [Member] Subordinated Notes Two Point One Zero Eight Percent Due October Twenty Forty Seven [Member] Unrealized holding gains (losses) on fixed maturity securities during period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Issuances Liability for Future Policy Benefit, Expected Net Premium, Issuance C and Lower Credit Rating C and Lower Credit Rating [Member] C and Lower Credit Rating [Member] Forgone 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Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Dividends paid to shareholders Payments of Dividends Foreign currency translation Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) from Foreign Currency Translation Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) from Foreign Currency Translation Securities lending, financial instruments, amount of liabilities offset against collateral Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Gross amount of liabilities offset in balance sheet Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Unrealized foreign currency translation gains (losses) during period, net of income taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Current Financial Asset, Not Past Due [Member] Equity securities Equity Securities [Member] Insurance Loss Reserves [Abstract] Insurance Loss Reserves [Abstract] .830% senior notes due March 2035 Senior Notes Point Eight Three Zero Percent Due March Twenty Thirty FIve [Member] Yen-denominated senior notes .830% due March 2035 Commercial Mortgage and Other Loans by Property Type Schedule of Participating Mortgage Loans [Table Text Block] Total liabilities Liabilities Liabilities Currency [Axis] Currency [Axis] Line of credit facility, commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Broker/other Broker/other [Member] Broker/other Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Securities lending, net amounts of assets presented in balance sheet Securities Borrowed Fixed maturity securities available-for-sale Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Debt instrument, principal amount redeemed Debt Instrument, Repurchased Face Amount Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 3.040% senior notes due May 2045 Senior Notes Three Point Zero Four Zero Percent Due May Twenty Forty Five [Member] Senior Notes Three Point Zero Four Zero Percent Due May Twenty Forty Five Gross premiums Liability for Future Policy Benefit, Gross Premium Income Offsetting Assets [Line Items] Offsetting Assets [Line Items] Derivative, collateral, right to reclaim securities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] 4.00% senior notes due October 2046 Senior Notes Four Point Zero Zero Percent Due October Twenty Forty Six [Member] Senior Notes Four Point Zero Zero Percent Due October Twenty Forty Six [Member] Mortgage- and asset-backed securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Share Repurchase Program Share Repurchase Program [Member] Share Repurchase Program [Member] Schedule of Changes in Other Policyholders' Funds Policyholder Account Balance [Table Text Block] Fixed maturity securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Foreign currency translation Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) from Foreign Currency Translation Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) from Foreign Currency Translation Fixed maturity securities, available-for-sale Fair Value Total fixed maturity securities, available-for-sale, fair value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Other corporate Corporate Debt Securities [Member] Japan National Government [Member] Japan National Government [Member]