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Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]      
Gross gains on sales $ 234 $ 114 $ 275
Gross losses on sales (56) (172) (113)
Net OTTI losses recognized in earnings (3) (1) (8)
Total net realized capital gains (losses) 395 (112) 165
Equity Securities, FV-NI, Unrealized Gain (Loss) 164 (80)  
Other investments      
Schedule of Investments [Line Items]      
Other, net (35) (5) 12
Non-qualifying      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives (24) (12) (6)
Non-qualifying | Other Credit Derivatives [Member]      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives (9) 1 14
Foreign Currency Derivatives | Non-qualifying      
Schedule of Investments [Line Items]      
Non-qualifying foreign currency derivatives 1 3 (14)
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Debt and Equity Securities, Gain (Loss) 254 (48) 0
Net OTTI losses recognized in earnings     (6)
Mortgage loans      
Schedule of Investments [Line Items]      
Valuation allowances on mortgage loans $ (1) $ 0 $ 1