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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost $ 62,332 $ 59,663
Fixed maturity securities, available-for-sale 54,171 [1] 52,901 [2]
Canadian Province Of Quebec Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 1,415 1,436
Fixed maturity securities, available-for-sale 1,465 1,649
Canadian Province Of Ontario Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 1,001 982
Fixed maturity securities, available-for-sale $ 1,014 $ 1,068
[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 September 30, 2023, the fair value of such investments was $818 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