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REINSURANCE Additional Information (Detail) $ in Millions, ¥ in Billions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2023 JPY (¥) | Dec. 31, 2022 USD ($)
Effects of Reinsurance [Line Items] |  |  |  |  |
Deferred reinsurance gain liability | $ 175 |  |  |  | $ 692
Reinsurance recoverable | 183 |  |  |  | 912
Reinsurance recoverable, allowance for credit loss | 10 |  |  |  | $ 8
Aflac Re Bermuda | ALIJ |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |
Pretax loss on reinsurance novation | $ (151) |  |  |  |
Ceded insurance, percentage |  | 30.00% | 28.00% |  |
Coinsurance, amount of reserves transferred |  | $ 1,900 | $ 2,100 |  |
Coinsurance, amount of assets transferred |  | $ 1,700 | $ 1,900 |  |
Reinsurer, Other | ALIJ |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |
Ceded insurance, percentage |  |  | 1.50% |  |
Aflac Japan |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |
Committed reinsurance facility | ¥ |  |  |  | ¥ 120 |

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479616/944-310-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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