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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 3 $ 2 $ 4 $ 0
Realized capital gains (losses) (2) (83) (26) (170)
Proceeds from sale of investments        
Proceeds on sales 352 1,180 1,575 1,840
Gross gains 7 7 19 11
Gross losses 3 20 14 27
Derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (50) 6 (82) 11
Other investments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 1 0 (1) 5
Embedded derivatives - fixed maturities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 1 (2) 2 (4)
Guaranteed benefit derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (13) 12 (13) 32
Fixed Maturities, Available-for-sale, Including Securities Pledged        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 3 (19) (13) (33)
Fixed maturities, at fair value using the fair value option        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 53 (82) 77 (181)
Equity securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ 3 $ 2 $ 4 $ 0