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BUSINESS SEGMENT AND SELECTED FOREIGN CURRENCY TRANSLATION ITEMS - Information on Transfers of Funds from Aflac Japan (Detail) $ in Millions, ¥ in Billions | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2023 JPY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 JPY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 JPY (¥)
Segment Reporting [Abstract] |  |  |  |  |  |
Management fees | $ 67 |  | $ 61 |  | $ 59 |
Profit remittances | 2,623 | ¥ 374.7 | 2,412 | ¥ 324.2 | 2,138 | ¥ 236.7
Total transfers from Aflac Japan | $ 2,690 |  | $ 2,473 |  | $ 2,197 |

X
- Definition Intercompany Transfer Amount + References No definition available. + Details
Name: | afl_IntercompanyTransferAmount
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Intercompany Transfer Management Fees Amount + References No definition available. + Details
Name: | afl_IntercompanyTransferManagementFeesAmount
Namespace Prefix: | afl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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