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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Net earned premiums [1] $ 3,304 $ 3,372 $ 9,866 $ 10,223
Net investment income 1,003 1,067 2,943 3,103
Other income 36 26 101 81
Total revenues 3,271 4,740 11,734 12,298
Net investment gains (losses) (1,072) 275 (1,176) (1,109)
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
Segment Reconciling Items        
Segment Reporting [Line Items]        
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
Aflac Japan | Operating Segments        
Segment Reporting [Line Items]        
Net earned premiums [1] 1,508 1,663 4,618 5,105
Net investment income 639 665 1,846 1,950
Other income 9 7 25 24
Total revenues [1] 2,156 2,335 6,489 7,079
Aflac U.S. | Operating Segments        
Segment Reporting [Line Items]        
Net earned premiums 1,544 1,495 4,638 4,501
Net investment income 212 214 621 623
Other income 25 19 72 53
Total revenues 1,781 1,728 5,331 5,177
Corporate and other | Operating Segments        
Segment Reporting [Line Items]        
Total revenues [2] $ 360 $ 343 $ 943 $ 1,005
[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.