v3.26.1
POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Expected Future Policy Benefits and Expenses (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 138,849 $ 143,474
Benefits and Expenses 167,353 173,047
Aflac Japan | Cancer    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 49,894 52,505
Benefits and Expenses 52,168 54,844
Aflac Japan | Medical and other health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 30,305 32,757
Benefits and Expenses 33,101 35,043
Aflac Japan | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 10,216 10,781
Benefits and Expenses 35,461 37,340
Aflac Japan | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,245 1,351
Benefits and Expenses 6,068 6,419
Aflac U.S. | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 3,637 3,326
Benefits and Expenses 4,239 3,948
Aflac U.S. | Accident    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 8,460 8,560
Benefits and Expenses 4,591 4,660
Aflac U.S. | Disability    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 5,683 5,697
Benefits and Expenses 3,045 3,033
Aflac U.S. | Critical care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 19,128 19,182
Benefits and Expenses 19,953 19,971
Aflac U.S. | Hospital indemnity    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 4,771 4,757
Benefits and Expenses 3,038 3,027
Aflac U.S. | Dental/vision    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,064 1,081
Benefits and Expenses 656 657
Aflac U.S. | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 4,446 3,477
Benefits and Expenses $ 5,033 $ 4,105