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Guaranteed Benefit Features (Information On Guaranteed Death Benefit Features) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Return of Net Deposits [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 116,102 $ 109,856
Net amount at risk $ 77 $ 72
Average attained age of contract holders 66 years 66 years
Minimum Return [Member]    
Net Amount at Risk by Product and Guarantee [Line Items]    
Total account value $ 102 $ 100
Net amount at risk $ 12 $ 12
Average attained age of contract holders 79 years 78 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 $ 28,828 $ 27,650
Net amount at risk $ 394 $ 390
Average attained age of contract holders 72 years 72 years