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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Available for sale, fixed maturity securities, amortized cost | $ 79,371 | $ 76,856 |  |
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) | 1,349,309 | 1,347,540 | 1,345,762 | 1,342,498
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Available for sale, fixed maturity securities, amortized cost | $ 1,506 | $ 1,209 |  |
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) | 1,349,309 | 1,347,540 |  |

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