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Investments - Realized Capital Gains and Losses by Transaction Type (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investments [Abstract]    
Impairment write-downs $ (7) $ (1)
Change in intent write-downs 0 0
Net OTTI losses recognized in earnings (7) (1)
Sales (6) (5)
Valuation of equity investments 157 (23)
Valuation and settlements of derivative instruments 4 (3)
Total realized capital gains and losses $ 148 $ (32)