Investments (Exposure To Concentrations Of Credit Risk) (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]
JAPAN
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	5,297		3,630
Fixed maturity securities, available-for-sale	4,463		3,131
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,681		2,725
Fixed maturity securities, available-for-sale	1,428	[1]	2,520	[2]
Canadian Province Of Quebec Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,571		1,467
Fixed maturity securities, available-for-sale	1,744		1,748
Canadian Province Of Ontario Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for Sale at Fair value - Amortized cost	1,157		1,019
Fixed maturity securities, available-for-sale	$ 1,225		$ 1,125

[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