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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 149,085 | $ 156,494
Benefits and Expenses | 182,776 | 193,058
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 55,096 | 59,169
Benefits and Expenses | 61,876 | 66,427
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 35,735 | 38,583
Benefits and Expenses | 37,277 | 39,884
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 11,637 | 12,677
Benefits and Expenses | 39,439 | 42,541
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,824 | 2,719
Benefits and Expenses | 3,367 | 3,260
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 9,097 | 9,095
Benefits and Expenses | 4,551 | 4,548
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,819 | 5,776
Benefits and Expenses | 3,210 | 3,177
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 20,008 | 19,886
Benefits and Expenses | 20,712 | 20,626
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,985 | 4,922
Benefits and Expenses | 3,058 | 3,025
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,161 | 1,162
Benefits and Expenses | 729 | 726
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,646 | 1,781
Benefits and Expenses | 6,923 | 7,448
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,077 | 724
Benefits and Expenses | $ 1,634 | $ 1,396

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