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Investments (Sales or Disposals and Impairments of Fixed Maturity AFS 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 $ 51,052 $ 85,058 $ 56,509
Gross investment gains 889 856 753
Gross investment (losses) (493) (811) (425)
OTTI losses (129) (40) (10)
Net investment gains (losses) $ 267 $ 5 $ 318