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STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - Profit Remittances by Aflac Japan (Detail) $ in Millions, ¥ in Billions | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2024 JPY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 JPY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 JPY (¥)
Insurance [Abstract] |  |  |  |  |  |
Profit remittances | $ 2,865 | ¥ 441.6 | $ 2,623 | ¥ 374.7 | $ 2,412 | ¥ 324.2

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- Definition Amount of foreign earnings repatriated from subsidiaries outside the country of domicile. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration