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POLICY LIABILITIES - Summary of Discounted Expected Future Gross Premiums and Future Benefits and Expenses (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 115,301 | $ 132,451 |
Benefits and Expenses | 123,918 | 141,463 |
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 45,569 | 53,278 |
Benefits and Expenses | 47,209 | 54,766 | $ 72,747
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 29,117 | 34,693 |
Benefits and Expenses | 23,593 | 27,419 | 36,021
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 10,780 | 12,951 |
Benefits and Expenses | 27,928 | 31,954 | 42,720
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,797 | 1,663 |
Benefits and Expenses | 1,608 | 1,526 | 1,843
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 6,144 | 6,510 |
Benefits and Expenses | 2,964 | 3,098 | 3,949
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 4,319 | 4,468 |
Benefits and Expenses | 2,351 | 2,445 | 2,871
Critical Care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 11,752 | 12,659 |
Benefits and Expenses | 10,460 | 11,489 | 15,388
Hospital Indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 3,301 | 3,483 |
Benefits and Expenses | 1,847 | 2,074 | 2,552
Dental/Vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 768 | 821 |
Benefits and Expenses | 450 | 488 | 616
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 1,438 | 1,697 |
Benefits and Expenses | 4,856 | 5,582 | 7,322
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 316 | 228 |
Benefits and Expenses | $ 652 | $ 622 | $ 837

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