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POLICY LIABILITIES - Schedule of Weighted-Average Interest Rate and Liability for Future Policy Benefit (Details) | Sep. 30, 2025 | Dec. 31, 2024
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Aflac Japan | Cancer |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Weighted-average interest, original discount rate | [1] | 3.80% | 3.90%
Weighted-average interest, current discount rate | [1] | 2.90% | 2.20%
Weighted-average liability duration |  | 12 years 4 months 24 days | 12 years 7 months 6 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] | 3.50% | 2.80%
Weighted-average liability duration |  | 23 years 1 month 6 days | 23 years 6 months
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] | 2.70% | 2.10%
Weighted-average liability duration |  | 16 years 3 months 18 days | 16 years 1 month 6 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] | 3.20% | 2.50%
Weighted-average liability duration |  | 16 years 3 months 18 days | 16 years 8 months 12 days
Aflac U.S. | Life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Weighted-average interest, original discount rate | [1] | 3.90% | 3.80%
Weighted-average interest, current discount rate | [1] | 5.30% | 5.30%
Weighted-average liability duration |  | 13 years 6 months | 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% | 4.00%
Weighted-average interest, current discount rate | [1] | 5.20% | 5.30%
Weighted-average liability duration |  | 7 years 9 months 18 days | 7 years 8 months 12 days
Aflac U.S. | Disability |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Weighted-average interest, original discount rate | [1] | 4.30% | 4.30%
Weighted-average interest, current discount rate | [1] | 5.00% | 5.20%
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% | 4.60%
Weighted-average interest, current discount rate | [1] | 5.40% | 5.30%
Weighted-average liability duration |  | 10 years 10 months 24 days | 11 years 1 month 6 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] | 5.30% | 5.30%
Weighted-average liability duration |  | 9 years | 9 years
Aflac U.S. | Dental/Vision |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Weighted-average interest, original discount rate | [1] | 4.30% | 4.30%
Weighted-average interest, current discount rate | [1] | 5.20% | 5.30%
Weighted-average liability duration |  | 7 years 7 months 6 days | 7 years 7 months 6 days
Aflac U.S. | Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Weighted-average interest, original discount rate | [1] | 5.50% | 5.40%
Weighted-average interest, current discount rate | [1] | 5.40% | 5.30%
Weighted-average liability duration |  | 8 years 9 months 18 days | 9 years 1 month 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.

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