v3.26.3
POLICY LIABILITIES - Reconciliation of Future Policy Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits $ 55,983 $ 62,320
Deferred reinsurance gain liability 294 125
Intercompany eliminations    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits [1] (6,863) (4,997)
Aflac Japan    
Liability for Future Policy Benefit, Activity [Line Items]    
Deferred profit liability 2,119 2,066
Deferred reinsurance gain liability 872 757
Aflac Japan | Cancer    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 19,827 22,780
Aflac Japan | Medical and other health    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 6,516 7,343
Aflac Japan | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 14,383 16,347
Aflac Japan | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 2,669 2,946
Aflac U.S. | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 1,007 1,055
Aflac U.S. | Accident    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 628 659
Aflac U.S. | Disability    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 568 651
Aflac U.S. | Critical care    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 6,179 6,900
Aflac U.S. | Hospital indemnity    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 682 784
Aflac U.S. | Dental/vision    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 212 236
Aflac U.S. | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits 445 476
Corporate and other    
Liability for Future Policy Benefit, Activity [Line Items]    
Future policy benefits $ 6,739 $ 4,317
[1] Elimination entry necessary due to the internal reinsurance transactions with Aflac Re and to recapture a portion of policy liabilities ceded externally as a result of the reinsurance retrocession transaction. See Note 8 of the Notes to the Consolidated Financial Statements in the 2025 Annual Report.