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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (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]
Collateral Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 588 355
Fixed maturity securities, available-for-sale 488 292
Collateral Received Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, available-for-sale 1,625 1,428
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust 32,645 31,510
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust $ 28,354 $ 27,817
[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