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Investments - Realized capital gains and losses by transaction type (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investments [Abstract]        
Impairment write-downs $ (14) $ (5) $ (43) $ (10)
Sales 147 (22) 359 (139)
Valuation of equity investments 24 198 851 149
Valuation and settlements of derivative instruments 40 5 16 17
Total realized capital gains and losses $ 197 $ 176 $ 1,183 $ 17