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Investments (Sales or Disposals and Impairments of Fixed Maturity and Equity Securities) (Details) - Fixed Maturity Securities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]      
Proceeds $ 85,058 $ 56,509 $ 86,179
Gross investment gains 856 753 1,048
Gross investment losses (811) (425) (797)
Total OTTI losses recognized in earnings:      
OTTI losses (40) (10) (107)
Net investment gains (losses) $ 5 $ 318 $ 144