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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]        
Impairment write-downs $ (4) $ (6) $ (7) $ (39)
Change in intent write-downs 0 0 0 (4)
Net OTTI losses recognized in earnings (4) (6) (7) (43)
Sales (2) 29 (14) 70
Valuation of equity investments 50 0 37 0
Valuation and settlements of derivative instruments 4 (4) 8 (13)
Total realized capital gains and losses $ 48 $ 19 $ 24 $ 14