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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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Total revenues $ 3,271 $ 4,740 $ 11,734 $ 12,298  
Benefits and claims, excluding reserve remeasurement 1,892 2,016 5,704 6,049  
Reserve remeasurement (gains) losses (453) (580) (581) (658)  
Total benefits and claims, net 1,439 1,436 5,123 5,391  
Amortization of deferred policy acquisition costs 220 218 659 655 $ 874
Insurance commissions 237 254 713 745  
Insurance and other expenses 805 781 2,325 2,387  
Total benefits and expenses 2,771 2,746 9,014 9,337  
Net investment gains (losses) (1,072) 275 (1,176) (1,109)  
Earnings before income taxes 500 1,994 2,720 2,961  
Income taxes applicable to pretax adjusted earnings 312 333 751 791  
Effect of foreign currency translation on after-tax adjusted earnings (14) 1 (49) 16  
Remeasurement gain (loss), deferred profit liability for limited-payment contracts 52 (55) 52 (55)  
Change in value of federal historic rehabilitation and solar tax credit investments (4) (6) (15) (22)  
Federal historic rehabilitation and solar tax credits, amount 5 7 16 24  
Operating Segments          
Segment Reporting [Line Items]          
Total revenues 4,297 4,406 12,763 13,261  
Total benefits and expenses 2,771 2,746 9,014 9,280  
Pretax adjusted earnings 1,526 1,660 3,749 3,981  
Segment Reconciling Items          
Segment Reporting [Line Items]          
Other income (loss) 0 (1) 0 (54)  
Net investment gains (losses) (1,072) 275 (1,176) (1,109)  
Amortized hedge costs 11 13 38 31  
Amortized hedge income (14) (20) (51) (80)  
Net interest (income) expense from derivatives associated with certain investment strategies 49 66 160 195  
Impact of interest from derivatives associated with notes payable 0 1 0 (3)  
Aflac Japan | Operating Segments          
Segment Reporting [Line Items]          
Total revenues [1] 2,156 2,335 6,489 7,079  
Benefits and claims, excluding reserve remeasurement 938 1,130 2,979 3,446  
Reserve remeasurement (gains) losses (201) (474) (269) (513)  
Total benefits and claims, net 737 656 2,710 2,933  
Amortization of deferred policy acquisition costs 79 81 233 245  
Insurance commissions 93 111 282 328  
Insurance and other expenses 286 271 803 845  
Total benefits and expenses 1,195 1,119 4,028 4,351  
Pretax adjusted earnings [1] 961 1,216 2,461 2,728  
Aflac U.S. | Operating Segments          
Segment Reporting [Line Items]          
Total revenues 1,781 1,728 5,331 5,177  
Benefits and claims, excluding reserve remeasurement 790 752 2,342 2,219  
Reserve remeasurement (gains) losses (161) (71) (217) (110)  
Total benefits and claims, net 629 681 2,125 2,109  
Amortization of deferred policy acquisition costs 141 137 426 410  
Insurance commissions 144 143 431 417  
Insurance and other expenses 374 392 1,123 1,120  
Total benefits and expenses 1,288 1,353 4,105 4,056  
Pretax adjusted earnings 493 375 1,226 1,121  
Corporate and other | Operating Segments          
Segment Reporting [Line Items]          
Total revenues [2] 360 343 943 1,005  
Total benefits and expenses 288 274 881 873  
Pretax adjusted earnings [2] $ 72 $ 69 $ 62 $ 132  
[1] Includes a gain (loss) of $52 and $(55) for the three-month periods and $52 and $(55) for the nine-month periods ended September 30, 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 $4 and $6 for the three-month periods and $15 and $22 for the nine-month periods ended September 30, 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 and $16 and $24 for the nine-month periods ended September 30, 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.