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Investments - Realized capital gains and losses by transaction type (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments [Abstract]      
Impairment write-downs $ (14) $ (102) $ (234)
Change in intent write-downs 0 (48) (69)
Net OTTI losses recognized in earnings (14) (150) (303)
Sales (215) 641 213
Valuation of equity investments (691) 0 0
Valuation and settlements of derivative instruments 43 (46) 0
Total realized capital gains and losses (877) 445 (90)
Fixed income and equity securities      
Schedule of Available for Sale Securities      
Fixed income. realized gain 120    
Fixed income, realized loss $ 347    
Gross gains on sales of fixed income securities   737 631
Gross loss on sales of fixed income securities   $ 276 $ 461