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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) $ (144,000,000) $ (242,000,000) $ (200,000,000)
Equity Securities, Securities Still Held, Change in Fair Value Recognized through the Income Statement (16,000,000) (4,000,000)  
Proceeds from sale of investments      
Proceeds on sales 2,418,000,000 2,498,000,000 2,916,000,000
Gross gains 30,000,000 14,000,000 30,000,000
Gross losses 25,000,000 50,000,000 39,000,000
Fixed maturities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) 2,000,000 (4,000,000) (5,000,000)
Guaranteed benefit derivatives      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (11,000,000) 94,000,000 55,000,000
Derivatives      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (82,000,000) (36,000,000) 9,000,000
Other investments      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (1,000,000) 4,000,000 (4,000,000)
Fixed maturities, available-for-sale, including securities pledged      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) 11,000,000 (69,000,000) (29,000,000)
Fixed maturities, at fair value using the fair value option      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (47,000,000) (227,000,000) (226,000,000)
Equity securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) $ (16,000,000) $ (4,000,000) $ 0