v3.26.3
POLICY LIABILITIES - Schedule of Weighted-Average Interest Rate and Liability Duration for Future Policy Benefit (Details)
Sep. 30, 2026
Dec. 31, 2025
Aflac Japan | Cancer    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 3.80% 3.80%
Weighted-average interest, current discount rate [1] 4.10% 3.10%
Weighted-average liability duration 12 years 12 years 3 months 18 days
Aflac Japan | Medical and other health    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 2.50% 2.50%
Weighted-average interest, current discount rate [1] 4.70% 3.60%
Weighted-average liability duration 21 years 9 months 18 days 22 years 10 months 24 days
Aflac Japan | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 2.10% 2.10%
Weighted-average interest, current discount rate [1] 3.80% 2.80%
Weighted-average liability duration 15 years 9 months 18 days 16 years 2 months 12 days
Aflac Japan | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 1.80% 1.80%
Weighted-average interest, current discount rate [1] 4.40% 3.40%
Weighted-average liability duration 15 years 6 months 16 years 2 months 12 days
Aflac U.S. | Life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.00% 3.90%
Weighted-average interest, current discount rate [1] 5.80% 5.30%
Weighted-average liability duration 13 years 10 months 24 days 13 years 6 months
Aflac U.S. | Accident    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.10% 4.10%
Weighted-average interest, current discount rate [1] 5.70% 5.20%
Weighted-average liability duration 7 years 6 months 7 years 9 months 18 days
Aflac U.S. | Disability    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.40% 4.40%
Weighted-average interest, current discount rate [1] 5.50% 5.00%
Weighted-average liability duration 5 years 7 months 6 days 5 years 7 months 6 days
Aflac U.S. | Critical care    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.50% 4.50%
Weighted-average interest, current discount rate [1] 5.80% 5.40%
Weighted-average liability duration 10 years 6 months 10 years 9 months 18 days
Aflac U.S. | Hospital indemnity    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.50% 4.50%
Weighted-average interest, current discount rate [1] 5.70% 5.30%
Weighted-average liability duration 8 years 4 months 24 days 9 years
Aflac U.S. | Dental/vision    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 4.40% 4.30%
Weighted-average interest, current discount rate [1] 5.70% 5.20%
Weighted-average liability duration 7 years 6 months 7 years 6 months
Aflac U.S. | Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average interest, original discount rate [1] 5.50% 5.50%
Weighted-average interest, current discount rate [1] 5.80% 5.40%
Weighted-average liability duration 8 years 2 months 12 days 8 years 7 months 6 days
[1] The weighted-average interest rates are calculated using the reserve balances as the weights. No adjustments were made to observable market information.