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REINSURANCE Effect of Reinsurance on Premiums and Benefits and Claims (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct premium income |  |  |  |  |  |  |  |  | $ 14,318 |  | $ 15,025 |  | $ 17,305 |
Ceded premiums |  |  |  |  |  |  |  |  | (404) |  | (419) |  | (504) |
Assumed premiums earned |  |  |  |  |  |  |  |  | 209 |  | 295 |  | 294 |
Net premium income | $ 3,385 | $ 3,476 | $ 3,573 | $ 3,688 | $ 3,523 | $ 3,535 | $ 3,764 | $ 4,079 | 14,123 | [1] | 14,901 | [1] | 17,095 | [1]
Direct benefits and claims, excluding reserve remeasurement |  |  |  |  |  |  |  |  | 8,599 |  | 9,171 |  | 10,778 |
Reserve remeasurement (gains) losses |  |  |  |  |  |  |  |  | (394) |  | (196) |  | (149) |
Direct benefits and claims |  |  |  |  |  |  |  |  | 8,205 |  | 8,975 |  | 10,629 |
Reserve remeasurement (gains) losses, ceded benefits and claims |  |  |  |  |  |  |  |  | 11 |  | (19) |  | 2 |
Benefits and claims, net |  |  |  |  |  |  |  |  | 8,211 |  | 8,887 |  | 10,476 |
Intercompany eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded benefits and claims |  |  |  |  |  |  |  |  | 200 |  | 18 |  | 27 |
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | (196) |  | (24) |  | (31) |
All other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded premiums |  |  |  |  |  |  |  |  | (91) |  | (76) |  | (73) |
Assumed premiums earned |  |  |  |  |  |  |  |  | 83 |  | 151 |  | 114 |
Ceded benefits and claims |  |  |  |  |  |  |  |  | (64) |  | (32) |  | (44) |
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | 220 |  | 131 |  | 109 |
Aflac Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premium income |  |  |  |  |  |  |  |  | 8,047 |  | 9,186 |  | 11,301 |
Benefits and claims, net |  |  |  |  |  |  |  |  | 5,313 |  | 6,191 |  | 7,675 |
Aflac Japan | Closed block |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded premiums |  |  |  |  |  |  |  |  | (313) |  | (343) |  | (431) |
Assumed premiums earned |  |  |  |  |  |  |  |  | 126 |  | 144 |  | 180 |
Ceded benefits and claims |  |  |  |  |  |  |  |  | (283) |  | (308) |  | (381) |
Assumed benefits and claims from other companies |  |  |  |  |  |  |  |  | $ 118 |  | $ 146 |  | $ 165 |
[1] | Includes a gain (loss) of $20, $(42) and $(11) in 2023, 2022 and 2021, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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