v3.25.2
POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 150,364 $ 142,653
Benefits and Expenses 185,069 173,393
Aflac Japan | Cancer    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 55,334 51,712
Benefits and Expenses 61,226 56,881
Aflac Japan | Medical and other health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 35,449 33,250
Benefits and Expenses 37,821 34,864
Aflac Japan | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 11,752 10,915
Benefits and Expenses 40,586 37,520
Aflac Japan | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,558 1,477
Benefits and Expenses 6,965 6,479
Aflac U.S. | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 3,156 2,966
Benefits and Expenses 3,786 3,559
Aflac U.S. | Accident    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 8,778 8,862
Benefits and Expenses 4,647 4,687
Aflac U.S. | Disability    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 5,717 5,727
Benefits and Expenses 3,097 3,094
Aflac U.S. | Critical Care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 19,693 19,624
Benefits and Expenses 20,424 20,340
Aflac U.S. | Hospital Indemnity    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 4,906 4,859
Benefits and Expenses 3,044 3,017
Aflac U.S. | Dental/Vision    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 1,113 1,118
Benefits and Expenses 685 679
Aflac U.S. | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 2,908 2,143
Benefits and Expenses $ 2,788 $ 2,273