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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Available-for-sale Securities Including Securities Pledged [Line Items]    
Equity Securities, Securities Still Held, Change in Fair Value Recognized through the Income Statement $ 1 $ (2)
Realized capital gains (losses) (24) (87)
Proceeds from sale of investments    
Fixed maturities 1,223 660
Gross gains 12 4
Gross losses 11 7
Derivatives    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) (32) 5
Other investments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) (2) 5
Fixed Maturities, Available-for-sale, Including Securities Pledged    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) (16) (14)
Fixed maturities, at fair value using the fair value option    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) 24 (99)
Equity securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) 1 (2)
Fixed maturities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) 1 (2)
Guaranteed benefit derivatives    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Realized capital gains (losses) $ 0 $ 20