v3.26.3
POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Expected Future Policy Benefits and Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 139,574 $ 143,474
Benefits and Expenses 167,720 173,047
Aflac Japan | Cancer    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 50,035 52,505
Benefits and Expenses 51,670 54,844
Aflac Japan | Medical and other health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 31,205 32,757
Benefits and Expenses 33,859 35,043
Aflac Japan | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 10,437 10,781
Benefits and Expenses 36,231 37,340
Aflac Japan | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,257 1,351
Benefits and Expenses 6,263 6,419
Aflac U.S. | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 3,824 3,326
Benefits and Expenses 4,407 3,948
Aflac U.S. | Accident    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 8,194 8,560
Benefits and Expenses 4,534 4,660
Aflac U.S. | Disability    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 5,641 5,697
Benefits and Expenses 2,975 3,033
Aflac U.S. | Critical care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 18,924 19,182
Benefits and Expenses 19,361 19,971
Aflac U.S. | Hospital indemnity    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 4,771 4,757
Benefits and Expenses 2,899 3,027
Aflac U.S. | Dental/vision    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,041 1,081
Benefits and Expenses 643 657
Aflac U.S. | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 4,245 3,477
Benefits and Expenses $ 4,878 $ 4,105