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BUSINESS SEGMENT INFORMATION - Operations by Segment - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net earned premiums [1] $ 3,310 $ 3,381
Net investment income 956 955
Other income 31 25
Total revenues 4,346 3,398
Net investment gains (losses) 49 (963)
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, Revenue Reconciling Item [Line Items]    
Total revenues 4,243 4,319
Segment Reconciling Items    
Segment Reporting, Revenue Reconciling Item [Line Items]    
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
Aflac Japan | Operating Segments    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net earned premiums [1] 1,573 1,681
Net investment income 591 586
Other income 8 5
Total revenues [1] 2,172 2,272
Aflac U.S. | Operating Segments    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net earned premiums 1,555 1,502
Net investment income 201 202
Other income 23 17
Total revenues 1,779 1,721
Corporate and other | Operating Segments    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Total revenues [2] $ 292 $ 326
[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.