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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost $ 64,977 $ 59,663
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 60,467 [1] 52,901 [2]
Canadian Province Of Ontario Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 1,019 982
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 1,125 1,068
Canadian Province Of Quebec Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 1,467 1,436
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 1,748 $ 1,649
[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2023, the fair value of such investments was $856 million
[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million.