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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums $ 105,902 $ 105,686  
Benefits and Expenses 107,596 111,508  
Aflac Japan | Cancer      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 40,078 40,170  
Benefits and Expenses 38,261 40,781 $ 50,161
Aflac Japan | Medical and other health      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 24,387 25,171  
Benefits and Expenses 19,391 20,606 25,257
Aflac Japan | Life insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 9,268 9,367  
Benefits and Expenses 22,758 24,265 29,731
Aflac Japan | Other      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 1,122 1,204  
Benefits and Expenses 4,025 4,225 5,178
Aflac U.S. | Life insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 2,298 2,050  
Benefits and Expenses 2,032 1,847 1,764
Aflac U.S. | Accident      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 6,097 6,057  
Benefits and Expenses 3,235 3,127 3,109
Aflac U.S. | Disability      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 4,495 4,404  
Benefits and Expenses 2,341 2,330 2,422
Aflac U.S. | Critical Care      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 12,138 11,900  
Benefits and Expenses 10,931 10,701 11,290
Aflac U.S. | Hospital Indemnity      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 3,390 3,312  
Benefits and Expenses 1,972 1,897 1,943
Aflac U.S. | Dental/Vision      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 762 761  
Benefits and Expenses 441 441 478
Aflac U.S. | Other      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums 1,867 1,290  
Benefits and Expenses $ 2,209 $ 1,288 $ 798