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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | $ 142,128 | $ 156,494
Benefits and Expenses | 173,563 | 193,058
Cancer | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 51,506 | 59,169
Benefits and Expenses | 57,838 | 66,427
Medical and other health | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 33,233 | 38,583
Benefits and Expenses | 34,968 | 39,884
Life insurance | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 10,707 | 12,677
Benefits and Expenses | 36,842 | 42,541
Life insurance | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 2,865 | 2,719
Benefits and Expenses | 3,432 | 3,260
Accident | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 9,047 | 9,095
Benefits and Expenses | 4,533 | 4,548
Disability | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 5,811 | 5,776
Benefits and Expenses | 3,213 | 3,177
Critical Care | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 19,966 | 19,886
Benefits and Expenses | 20,670 | 20,626
Hospital Indemnity | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 4,964 | 4,922
Benefits and Expenses | 3,055 | 3,025
Dental/Vision | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,154 | 1,162
Benefits and Expenses | 729 | 726
Other | Aflac Japan |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,523 | 1,781
Benefits and Expenses | 6,467 | 7,448
Other | Aflac U.S. |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross Premiums | 1,352 | 724
Benefits and Expenses | $ 1,816 | $ 1,396

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