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Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]      
Gross gains on sales $ 114 $ 275 $ 222
Gross losses on sales (172) (113) (159)
Net OTTI losses recognized in earnings (1) (8) (27)
Transactional foreign currency revaluation 1 14 (78)
Total net realized capital gains (losses) (112) 165 (110)
Other investments      
Schedule of Investments [Line Items]      
Other, net (9) 12 (151)
Non-qualifying      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives (12) (6) 74
Foreign Currency Derivatives | Non-qualifying      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives 3 (14) 83
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Debt and Equity Securities, Gain (Loss) (48) 0 0
Net OTTI losses recognized in earnings   (6) (4)
Mortgage loans      
Schedule of Investments [Line Items]      
Valuation allowances on mortgage loans 0 (1) 0
Other Credit Derivatives [Member] | Non-qualifying      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives $ (15) $ 8 $ (9)