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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Available-for-sale Securities Including Securities Pledged [Line Items]        
Equity Securities, Securities Still Held, Change in Fair Value Recognized through the Income Statement $ 0 $ (1) $ 4 $ (1)
Realized capital gains (losses) 4 (44) (22) (214)
Proceeds from sale of investments        
Proceeds on sales 340 120 1,915 1,960
Gross gains 6 1 25 12
Gross losses 4 4 18 31
Derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 13 23 (69) 34
Other investments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (1) 0 (2) 5
Embedded derivatives - fixed maturities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 2 (1) 4 (5)
Guaranteed benefit derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (36) 24 (49) 56
Fixed Maturities, Available-for-sale, Including Securities Pledged        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 44 (9) 31 (42)
Fixed maturities, at fair value using the fair value option        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (18) (80) 59 (261)
Equity securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ 0 $ (1) $ 4 $ (1)