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Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings (losses) attributable to shareholders | $ (29) | $ 204 | $ 210 | $ 145 | $ 166 | $ 11 | $ 145 | $ 153 | $ 530 | $ 475 | $ 649
Comprehensive income (loss) attributable to shareholders |  |  |  |  |  |  |  |  | (14) | 771 | 711
AFG |  |  |  |  |  |  |  |  |  |  |
Statement of Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings (losses) attributable to shareholders |  |  |  |  |  |  |  |  | 530 | 475 | 649
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | (544) | 296 | 62
Comprehensive income (loss) attributable to shareholders |  |  |  |  |  |  |  |  | $ (14) | $ 771 | $ 711

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