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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 114,691 | $ 121,753 |
Benefits and Expenses | 123,453 | 132,131 |
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 44,795 | 48,363 |
Benefits and Expenses | 46,389 | 50,161 | $ 54,766
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 28,312 | 30,757 |
Benefits and Expenses | 23,331 | 25,257 | 27,419
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 10,274 | 11,240 |
Benefits and Expenses | 27,249 | 29,731 | 31,954
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,963 | 1,914 |
Benefits and Expenses | 1,775 | 1,764 | 1,526
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 6,293 | 6,369 |
Benefits and Expenses | 3,070 | 3,109 | 3,098
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,476 | 4,488 |
Benefits and Expenses | 2,423 | 2,422 | 2,445
Critical Care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 12,295 | 12,417 |
Benefits and Expenses | 11,102 | 11,290 | 11,489
Hospital Indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 3,425 | 3,419 |
Benefits and Expenses | 1,938 | 1,943 | 2,074
Dental/Vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 794 | 807 |
Benefits and Expenses | 474 | 478 | 488
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,391 | 1,512 |
Benefits and Expenses | 4,772 | 5,178 | 5,582
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 673 | 467 |
Benefits and Expenses | $ 930 | $ 798 | $ 622

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