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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 121,753 | $ 132,451 |
Benefits and Expenses | 132,131 | 141,463 |
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 48,363 | 53,278 |
Benefits and Expenses | 50,161 | 54,766 | $ 72,747
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 30,757 | 34,693 |
Benefits and Expenses | 25,257 | 27,419 | 36,021
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 11,240 | 12,951 |
Benefits and Expenses | 29,731 | 31,954 | 42,720
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,914 | 1,663 |
Benefits and Expenses | 1,764 | 1,526 | 1,843
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 6,369 | 6,510 |
Benefits and Expenses | 3,109 | 3,098 | 3,949
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,488 | 4,468 |
Benefits and Expenses | 2,422 | 2,445 | 2,871
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 12,417 | 12,659 |
Benefits and Expenses | 11,290 | 11,489 | 15,388
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 3,419 | 3,483 |
Benefits and Expenses | 1,943 | 2,074 | 2,552
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 807 | 821 |
Benefits and Expenses | 478 | 488 | 616
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,512 | 1,697 |
Benefits and Expenses | 5,178 | 5,582 | 7,322
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 467 | 228 |
Benefits and Expenses | $ 798 | $ 622 | $ 837

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