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Reserve for Future Policy Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reinsurance Recoverable Asset    
Reserve for future policy benefits $ 596 $ 638
Annuitization Benefit    
Liability    
Beginning balance 638 635
Incurred 61 85
Paid (94) (85)
Change in unrealized investment gains and losses (9) 3
Ending balance   638
Reinsurance Recoverable Asset    
Ending reinsurance recoverable asset $ 22 $ 28