Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions	Mar. 31, 2025		Dec. 31, 2024
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 89,709		$ 82,907
Fixed maturity securities, available-for-sale	84,507	[1]	77,617	[2]
Corporate Debt Securities [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	59,278		54,705
Fixed maturity securities, available-for-sale	$ 55,720	[1]	$ 50,991	[2]
% of Total	100.00%		100.00%
Corporate Debt Securities [Member] | Finance
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 18,647		$ 17,905
Fixed maturity securities, available-for-sale	$ 17,470		$ 16,673
% of Total	31.40%		32.70%
Corporate Debt Securities [Member] | Industrial
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 30,662		$ 28,267
Fixed maturity securities, available-for-sale	$ 28,958		$ 26,476
% of Total	52.00%		51.90%
Corporate Debt Securities [Member] | Utility
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 9,969		$ 8,533
Fixed maturity securities, available-for-sale	$ 9,292		$ 7,842
% of Total	16.60%		15.40%

[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 March 31, 2025, the fair value of such investments was $963 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