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DAC, VOBA, DSI, and DFEL (VOBA) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in VOBA [Roll Forward]      
Balance as of beginning-of-year $ 342 $ 816 $ 516
Business acquired (sold) through reinsurance     (11)
Business acquired     30
Deferrals 3 6 7
Amortization:      
Amortization, excluding unlocking (105) (114) (127)
Unlocking (205) 140 (60)
Accretion of interest 44 45 48
Adjustment related to realized (gains) losses   (1) (2)
Adjustment related to unrealized (gains) losses 168 (550) 415
Balance as of end-of-year $ 247 $ 342 $ 816
Interest accrual rate, low end 4.20% 4.20% 4.20%
Interest accrual rate, high end 6.90% 6.90% 6.90%