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Guaranteed Benefit Features (Summary Of Guaranteed Death Benefit Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Guaranteed Benefit Features [Abstract]    
Balance as of beginning-of-year $ 132 $ 121
Changes in reserves 38 8
Benefits paid (7) (5)
Balance as of end-of-period $ 163 $ 124