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Investments (Sales or Disposals of Fixed Maturity Securities) (Details) - Fixed maturity securities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Proceeds $ 8,541 $ 11,159 $ 11,974
Gross investment gains 232 101 58
Gross investment losses (145) (279) (84)
Net investment gains (losses) $ 87 $ (178) $ (26)