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Guaranteed Benefit Features (Information On Guaranteed Death Benefit Features) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 110,581 $ 143,744
Return of Net Deposits [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value 94,297 117,503
Net amount at risk $ 1,376 $ 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 $ 71 $ 102
Net amount at risk $ 14 $ 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 $ 21,730 $ 28,788
Net amount at risk $ 3,699 $ 400
Average attained age of contract holders 73 years 73 years