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Investments - Other Than Temporary Impairment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Credit impairments $ 1 $ 2 $ 21
Impairments on equity securities and other impairments 1 8 27
Intent-to-sell impairments 0 0 2
Total impairments 1 8 27
Cumulative Credit Impairments      
Beginning balance (25) (110) (113)
Additions for credit impairments recognized on:      
Securities not previously impaired 0 (1) (16)
Securities previously impaired (1) (1) (5)
Reductions for credit impairments previously recognized on:      
Securities that matured or were sold during the period 7 76 15
Securities due to an increase in expected cash flows 0 11 9
Ending balance $ (19) (25) (110)
Equity securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairments on equity securities and other impairments   $ 6 $ 4