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Investments - Realized capital gains and losses by transaction type (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments [Abstract]        
Impairment write-downs $ (15) $ (4) $ (29) $ (5)
Sales 117 (75) 212 (117)
Valuation of equity investments 200 34 827 (49)
Valuation and settlements of derivative instruments 22 20 (24) 12
Total realized capital gains and losses $ 324 $ (25) $ 986 $ (159)