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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments [Abstract]        
Impairment write-downs $ (2) $ (12) $ (3) $ (33)
Change in intent write-downs 0 (1) 0 (4)
Net OTTI losses recognized in earnings (2) (13) (3) (37)
Sales (7) 13 (12) 41
Valuation of equity investments 10 0 (13) 0
Valuation and settlements of derivative instruments 7 (4) 4 (9)
Total realized capital gains and losses $ 8 $ (4) $ (24) $ (5)