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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, 2019 USD ($) | Dec. 31, 2019 JPY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 JPY (¥)
Insurance [Abstract] |  |  |  |  |  |
Profit remittances | $ 2,070 | ¥ 225.2 | $ 808 | ¥ 89.7 | $ 1,150 | ¥ 129.3

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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