Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions	Jun. 30, 2024		Dec. 31, 2023
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 76,161		$ 64,977
Fixed maturity securities, available-for-sale	$ 70,491	[1]	$ 60,467	[2]
% of Total	100.00%		100.00%
Corporate Debt Securities [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 50,053		$ 42,014
Fixed maturity securities, available-for-sale	$ 46,131	[1]	$ 38,755	[2]
% of Total	65.40%		64.10%
Percentage Of Total Corporate Fixed Maturity Security	100.00%		100.00%
Corporate Debt Securities [Member] | Finance
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 16,448		$ 15,052
Fixed maturity securities, available-for-sale	$ 15,090		$ 13,789
Percentage Of Total Corporate Fixed Maturity Security	32.70%		35.60%
Corporate Debt Securities [Member] | Industrial
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 26,154		$ 21,413
Fixed maturity securities, available-for-sale	$ 24,306		$ 19,935
Percentage Of Total Corporate Fixed Maturity Security	52.70%		51.40%
Corporate Debt Securities [Member] | Utility
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 7,451		$ 5,549
Fixed maturity securities, available-for-sale	$ 6,735		$ 5,031
Percentage Of Total Corporate Fixed Maturity Security	14.60%		13.00%

[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