Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Millions	Jun. 30, 2025		Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	$ 91,888		$ 82,907
Fixed maturity securities, available-for-sale	86,043	[1]	77,617	[2]
Collateral Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,301		1,200
Fixed maturity securities, available-for-sale	1,098		1,046
Collateral Received Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available-for-sale	2,588		2,233
Reported Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Assets Held-in-trust	56,100		47,162
Estimate of Fair Value Measurement [Member]
Debt Securities, Available-for-sale [Line Items]
Assets Held-in-trust	52,824		44,473
Deposits
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	10		10
Fixed maturity securities, available-for-sale	9		8
Federal Home Loan Bank Certificates and Obligations (FHLB)
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	71		71
Fixed maturity securities, available-for-sale	$ 71		$ 71

[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, 2025, the fair value of such investments was $954 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, 2024, the fair value of such investments was $966 million