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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues $ 4,346 $ 3,398  
Benefits and claims, excluding reserve remeasurement 1,914 1,986  
Reserve remeasurement (gains) losses (82) (41)  
Total benefits and claims, net 1,832 1,945  
Amortization of deferred policy acquisition costs 221 216 $ 874
Insurance commissions 237 240  
Insurance and other expenses 771 802  
Total benefits and expenses 3,121 3,253  
Net investment gains (losses) 49 (963)  
Earnings before income taxes 1,225 145  
Income taxes applicable to pretax adjusted earnings 221 217  
Effect of foreign currency translation on after-tax adjusted earnings (8) (8)  
Change in value of federal historic rehabilitation and solar tax credit investments (5) (8)  
Federal historic rehabilitation and solar tax credits, amount 5 7  
Operating Segments      
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 4,243 4,319  
Total benefits and expenses 3,121 3,196  
Pretax adjusted earnings 1,122 1,123  
Segment Reconciling Items      
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Other income (loss) 0 (53)  
Net investment gains (losses) 49 (963)  
Amortized hedge costs 15 7  
Amortized hedge income (18) (30)  
Net interest (income) expense from derivatives associated with certain investment strategies 57 65  
Impact of interest from derivatives associated with notes payable 0 (4)  
Aflac Japan | Operating Segments      
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues [1] 2,172 2,272  
Benefits and claims, excluding reserve remeasurement 1,035 1,130  
Reserve remeasurement (gains) losses (45) (25)  
Total benefits and claims, net 990 1,105  
Amortization of deferred policy acquisition costs 78 79  
Insurance commissions 95 105  
Insurance and other expenses 250 261  
Total benefits and expenses 1,413 1,550  
Pretax adjusted earnings [1] 759 722  
Aflac U.S. | Operating Segments      
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 1,779 1,721  
Benefits and claims, excluding reserve remeasurement 770 731  
Reserve remeasurement (gains) losses (36) (15)  
Total benefits and claims, net 734 716  
Amortization of deferred policy acquisition costs 143 137  
Insurance commissions 142 135  
Insurance and other expenses 397 375  
Total benefits and expenses 1,416 1,363  
Pretax adjusted earnings 363 358  
Corporate and other | Operating Segments      
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues [2] 292 326  
Total benefits and expenses 292 283  
Pretax adjusted earnings [2] $ 0 $ 43  
[1] Includes a gain (loss) of an immaterial amount for the three-month periods ended March 31, 2026 and 2025, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.
[2] The change in value of federal historic rehabilitation and solar investments in partnerships of $5 and $8 for the three-month periods ended March 31, 2026 and 2025, respectively, is included as a reduction to net investment income. Tax credits on these investments of $5 and $7 for the three-month periods ended March 31, 2026 and 2025, respectively, have been reported as an income tax benefit in the consolidated statements of earnings. See Note 1 of the Notes to the Consolidated Financial Statements in the 2025 Annual Report for additional information on these investments.