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Schedule II - Aflac Incorporated (Parent Only) - Condensed Balance Sheet (Detail 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Available for sale, fixed maturity securities, allowance for credit losses | $ 0 | $ 0 |  |
Available for sale, fixed maturity securities, amortized cost | $ 70,689 | $ 75,469 |  |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |  |
Common stock, shares authorized (in shares) | 1,900,000 | 1,900,000 |  |
Common stock, shares issued (in shares) | 1,355,398 | 1,354,079 | 1,352,739 | 1,351,018
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Available for sale, fixed maturity securities, allowance for credit losses | $ 0 | $ 0 |  |
Available for sale, fixed maturity securities, amortized cost | $ 1,447 | $ 1,649 |  |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |  |
Common stock, shares authorized (in shares) | 1,900,000 | 1,900,000 |  |
Common stock, shares issued (in shares) | 1,355,398 | 1,354,079 |  |

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