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POLICY LIABILITIES - Summary of Net Earned Premiums Recognized (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | $ 14,123 | $ 14,901 | $ 17,095
Reinsurance ceded | (404) | (419) | (504)
Corporate and other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 400 | 145 | 180
Cancer | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 4,063 | 4,716 | 5,731
Medical and other health | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 2,631 | 2,917 | 3,570
Life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Reinsurance ceded | (52) | (35) | (29)
Life insurance | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,532 | 1,769 | 2,282
Life insurance | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 475 | 396 | 350
Accident | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,288 | 1,317 | 1,366
Disability | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,256 | 1,179 | 1,170
Critical care | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 1,749 | 1,758 | 1,801
Hospital indemnity | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 725 | 725 | 733
Dental/vision | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 214 | 199 | 188
Other | Aflac Japan |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | 149 | 161 | 186
Other | Aflac U.S. |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Net earned premiums | $ 45 | $ 38 | $ 42

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