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DAC, VOBA, DSI, and DFEL (DSI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in DSI [Roll Forward]      
Balance as of beginning-of-year $ 298 $ 287 $ 293
Business acquired (sold) through reinsurance   (21)  
Deferrals 26 48 29
Amortization, net of interest:      
Amortization, excluding unlocking, net of interest (28) (28) (30)
Unlocking (3)   (4)
Adjustment related to realized (gains) losses (2) (1) (2)
Adjustment related to unrealized (gains) losses (10) 13 1
Balance as of end-of-year $ 281 $ 298 $ 287