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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) segment | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2021 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of reportable insurance business segments | segment | 2 |  |  |  |
Accumulated other comprehensive income (loss) | $ (7,278) | $ (8,451) | $ (6,429) | $ (8,411) |
Retained earnings | $ 45,555 |  | $ 44,367 |  |
Capped transition date NPR | 10000.00% |  |  |  |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  | $ (18,600)
Pro Forma | Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ (300)
Aflac Japan |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of the Company's total revenues | 62.00% | 70.00% |  |  |
Percentage of the Company's total assets | 81.00% |  | 80.00% |  |

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