Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Millions	Jun. 30, 2024		Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	$ 76,161		$ 64,977
Fixed maturity securities, available-for-sale	70,491	[1]	60,467	[2]
Collateral Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,108		572
Fixed maturity securities, available-for-sale	960		517
Collateral Received Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	2,040		1,827
Reported Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Assets Held-in-trust	42,810		32,758
Estimate of Fair Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Assets Held-in-trust	39,907		30,359
Deposits
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	12		12
Fixed maturity securities, available-for-sale	9		9
Federal Home Loan Bank Certificates and Obligations (FHLB)
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	73		63
Fixed maturity securities, available-for-sale	$ 73		$ 63

[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 June 30, 2024, the fair value of such investments was $911 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, 2023, the fair value of such investments was $856 million