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POLICY LIABILITIES - Summary of Undiscounted Expected Future Gross Premiums and Future Benefits and Expenses (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 156,494 | $ 171,593 |
Benefits and Expenses | 193,058 | 209,402 |
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 59,169 | 65,454 | [1]
Benefits and Expenses | 66,427 | 73,009 | [1]
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 38,583 | 43,954 | [1]
Benefits and Expenses | 39,884 | 44,005 | [1]
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 12,677 | 14,685 | [1]
Benefits and Expenses | 42,541 | 46,166 | [1]
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 2,719 | 2,375 |
Benefits and Expenses | 3,260 | 2,787 |
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 9,095 | 9,481 |
Benefits and Expenses | 4,548 | 4,636 |
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 5,776 | 5,858 |
Benefits and Expenses | 3,177 | 3,267 |
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 19,886 | 21,069 |
Benefits and Expenses | 20,626 | 22,113 |
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,922 | 5,164 |
Benefits and Expenses | 3,025 | 3,338 |
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,162 | 1,208 |
Benefits and Expenses | 726 | 759 |
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,781 | 2,012 | [1]
Benefits and Expenses | 7,448 | 8,175 | [1]
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 724 | 333 |
Benefits and Expenses | $ 1,396 | $ 1,147 |
[1] | Prior-year amounts reflect the immaterial revision of amounts disclosed in the Company's Quarterly Reports on Form 10-Q for 2023 to correctly apply the yen/dollar exchange rate in effect for the period presented.

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