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BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Total revenues $ 4,740 $ 2,949 $ 12,298 $ 13,524  
Benefits and claims, excluding reserve remeasurement 2,016 2,003 6,049 6,042  
Reserve remeasurement (gains) losses (580) (408) (658) (515)  
Total benefits and claims, net 1,436 1,595 5,391 5,527  
Amortization of deferred policy acquisition costs 218 214 655 638 $ 851
Insurance commissions 254 251 745 751  
Insurance and other expenses 781 747 2,387 2,179  
Total benefits and expenses 2,746 2,857 9,337 9,242  
Net investment gains (losses) 275 (1,408) (1,109) 239  
Earnings before income taxes 1,994 92 2,961 4,282  
Income taxes applicable to pretax adjusted earnings 333 227 791 665  
Effect of foreign currency translation on after-tax adjusted earnings 1 (16) 16 (97)  
Remeasurement gain (loss), deferred profit liability for limited-payment contracts (55) (75) (55) (80)  
Change in value of federal historic rehabilitation and solar tax credit investments (6) (57) (22) (119)  
Federal historic rehabilitation and solar tax credits, amount 7 78 24 142  
Operating Segments          
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Total revenues 4,406 4,287 13,261 13,088  
Total benefits and expenses 2,746 2,849 9,280 9,216  
Pretax adjusted earnings 1,660 1,438 3,981 3,872  
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment          
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Other income (loss) (1) 0 (54) (1)  
Net investment gains (losses) 275 (1,408) (1,109) 239  
Amortized hedge costs 13 7 31 19  
Amortized hedge income (20) (25) (80) (87)  
Net interest (income) expense from derivatives associated with certain investment strategies 66 88 195 265  
Impact of interest from derivatives associated with notes payable 1 (8) (3) (25)  
Aflac Japan | Operating Segments          
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Total revenues [1] 2,335 2,378 7,079 7,297  
Benefits and claims, excluding reserve remeasurement 1,130 1,197 3,446 3,614  
Reserve remeasurement (gains) losses (474) (369) (513) (421)  
Total benefits and claims, net 656 828 2,933 3,193  
Amortization of deferred policy acquisition costs 81 82 245 242  
Insurance commissions 111 110 328 330  
Insurance and other expenses 271 285 845 785  
Total benefits and expenses 1,119 1,305 4,351 4,550  
Pretax adjusted earnings [1] 1,216 1,073 2,728 2,747  
Aflac U.S. | Operating Segments          
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Total revenues 1,728 1,684 5,177 5,068  
Benefits and claims, excluding reserve remeasurement 752 711 2,219 2,130  
Reserve remeasurement (gains) losses (71) (17) (110) (71)  
Total benefits and claims, net 681 694 2,109 2,059  
Amortization of deferred policy acquisition costs 137 132 410 396  
Insurance commissions 143 141 417 422  
Insurance and other expenses 392 367 1,120 1,102  
Total benefits and expenses 1,353 1,334 4,056 3,979  
Pretax adjusted earnings 375 350 1,121 1,089  
Corporate and other | Operating Segments          
Segment Reporting, Reconciling Item for Adjusted Profit (Loss) from Segment to Consolidated [Line Items]          
Total revenues [2] 343 225 1,005 723  
Total benefits and expenses 274 210 873 687  
Pretax adjusted earnings [2] $ 69 $ 15 $ 132 $ 36  
[1] Includes a gain (loss) of $(55) and $(75) for the three-month periods and $(55) and $(80) for the nine-month periods ended September 30, 2025 and 2024, 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 $6 and $57 for the three-month periods and $22 and $119 for the nine-month periods ended September 30, 2025, and 2024, respectively, is included as a reduction to net investment income. Tax credits on these investments of $7 and $78 for the three-month periods and $24 and $142 for the nine-month periods ended September 30, 2025, and 2024, respectively, have been recorded as an income tax benefit in the consolidated statements of earnings. See Note 3 for additional information on these investments.