v3.26.1
BUSINESS SEGMENT INFORMATION - Operations by Segment - Pretax Earnings (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Total revenues $ 4,117 $ 4,160 $ 8,463 $ 7,558  
Benefits and claims, excluding reserve remeasurement 1,898 2,047 3,812 4,033  
Reserve remeasurement (gains) losses (46) (37) (128) (78)  
Total benefits and claims, net 1,852 2,010 3,684 3,955  
Amortization of deferred policy acquisition costs 218 221 439 437 $ 874
Insurance commissions 239 251 476 491  
Insurance and other expenses 749 804 1,520 1,606  
Total benefits and expenses 3,122 3,338 6,243 6,591  
Net investment gains (losses) (153) (421) (104) (1,384)  
Earnings before income taxes 995 822 2,220 967  
Income taxes applicable to pretax adjusted earnings 218 241 439 458  
Effect of foreign currency translation on after-tax adjusted earnings (27) 23 (35) 15  
Change in value of federal historic rehabilitation and solar tax credit investments (6) (8) (11) (16)  
Federal historic rehabilitation and solar tax credits, amount 5 9 10 16  
Operating Segments          
Segment Reporting [Line Items]          
Total revenues 4,223 4,536 8,466 8,855  
Total benefits and expenses 3,122 3,338 6,243 6,534  
Pretax adjusted earnings 1,101 1,198 2,223 2,321  
Segment Reconciling Items          
Segment Reporting [Line Items]          
Other income (loss) 0 0 0 (53)  
Net investment gains (losses) (153) (421) (104) (1,384)  
Amortized hedge costs 12 11 27 18  
Amortized hedge income (19) (30) (37) (60)  
Net interest (income) expense from derivatives associated with certain investment strategies 54 64 111 129  
Impact of interest from derivatives associated with notes payable 0 0 0 (4)  
Aflac Japan | Operating Segments          
Segment Reporting [Line Items]          
Total revenues [1] 2,161 2,472 4,333 4,744  
Benefits and claims, excluding reserve remeasurement 1,006 1,186 2,041 2,316  
Reserve remeasurement (gains) losses (23) (14) (68) (39)  
Total benefits and claims, net 983 1,172 1,973 2,277  
Amortization of deferred policy acquisition costs 76 85 154 164  
Insurance commissions 94 112 189 217  
Insurance and other expenses 267 313 517 574  
Total benefits and expenses 1,420 1,682 2,833 3,232  
Pretax adjusted earnings [1] 741 790 1,500 1,512  
Aflac U.S. | Operating Segments          
Segment Reporting [Line Items]          
Total revenues 1,771 1,728 3,550 3,449  
Benefits and claims, excluding reserve remeasurement 782 736 1,552 1,467  
Reserve remeasurement (gains) losses (20) (24) (56) (39)  
Total benefits and claims, net 762 712 1,496 1,428  
Amortization of deferred policy acquisition costs 142 136 285 273  
Insurance commissions 145 139 287 274  
Insurance and other expenses 352 353 749 728  
Total benefits and expenses 1,401 1,340 2,817 2,703  
Pretax adjusted earnings 370 388 733 746  
Corporate and other | Operating Segments          
Segment Reporting [Line Items]          
Total revenues [2] 291 336 583 662  
Total benefits and expenses 301 316 593 599  
Pretax adjusted earnings [2] $ (10) $ 20 $ (10) $ 63  
[1] Includes a gain (loss) of an immaterial amount for the three- and six-month periods ended June 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 $6 and $8 for the three-month periods and $11 and $16 for the six-month periods ended June 30, 2026 and 2025, respectively, is included as a reduction to net investment income. Tax credits on these investments of $5 and $9 for the three-month periods and $10 and $16 for the six-month periods ended June 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.