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Schedule II - Aflac Incorporated (Parent Only) - Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Shareholder dividend reinvestment |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Treasury stock issued for shareholder dividend reinvestment | $ 37 | $ 37 | $ 32
Parent Company |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Interest paid | 184 | 211 | 213
Parent Company | Shareholder dividend reinvestment |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Treasury stock issued for shareholder dividend reinvestment | $ 37 | $ 37 | $ 32

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