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Guaranteed Benefit Features (Information On Guaranteed Death Benefit Features) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Return of Net Deposits [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 109,059 $ 117,503
Net amount at risk $ 232 $ 84
Average attained age of contract holders 67 years 67 years
Minimum Return [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 91 $ 102
Net amount at risk $ 12 $ 11
Average attained age of contract holders 79 years 79 years
Guaranteed minimum return 5.00% 5.00%
Anniversary Contract Value [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 26,308 $ 28,788
Net amount at risk $ 1,211 $ 400
Average attained age of contract holders 73 years 73 years