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Investments (excluding Consolidated Investment Entities) - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) $ (166) $ (355) $ (209)
Change in fair value of equity securities still held (16) (8)  
Proceeds from sale of investments      
Proceeds on sales 4,105 4,162 4,164
Gross gains 63 29 67
Gross losses 54 82 50
Fixed maturities, available-for-sale, including securities pledged      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) (21) (88) (13)
Fixed maturities, at fair value using the fair value option      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) 40 (357) (238)
Equity securities      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) (16) (9) (1)
Derivatives      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) (164) (16) (2)
Other investments      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) (2) 29 (10)
Fixed maturities      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) 3 (6) (10)
Guaranteed benefit derivatives      
Available-for-sale Securities, Including Securities Pledged [Line Items]      
Total net realized capital gains (losses) $ (6) $ 92 $ 65