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Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax expense (benefit) | $ (41) | $ (13) | $ 28
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net unrealized appreciation on investments |  |  |
Net realized gains (losses) | (302) | (15) | (119)
Income tax expense (benefit) | $ (41) | $ (13) | $ 28

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