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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) $ (92,000,000) $ (24,000,000) $ (24,000,000)
Equity Securities, Securities Still Held, Change in Fair Value Recognized through the Income Statement (5,000,000) (1,000,000)  
Proceeds from sale of investments      
Proceeds on sales 277,000,000 1,223,000,000  
Gross gains 5,000,000 12,000,000  
Gross losses 13,000,000 11,000,000  
Embedded derivatives - fixed maturities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) 4,000,000 1,000,000  
Guaranteed benefit derivatives      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (169,000,000) 0  
Derivatives      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) 46,000,000 (32,000,000)  
Other investments      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (5,000,000) (2,000,000)  
Fixed Maturities, Available-for-sale, Including Securities Pledged      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) (18,000,000) (16,000,000)  
Fixed Maturities, at Fair Value Using the Fair Value Option      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) 55,000,000 24,000,000  
Equity securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Realized capital gains (losses) $ (5,000,000) $ 1,000,000