Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 57,630	$ 55,873
Fixed maturity securities, available-for-sale	50,495	60,749
Corporate Debt Securities [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	38,293	35,239
Fixed maturity securities, available-for-sale	$ 32,655	$ 38,103
% of Total	100.00%	100.00%
Corporate Debt Securities [Member] | Financial Services Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 14,152	$ 13,101
Fixed maturity securities, available-for-sale	$ 12,064	$ 14,045
% of Total	36.90%	36.90%
Corporate Debt Securities [Member] | Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 19,434	$ 17,857
Fixed maturity securities, available-for-sale	$ 16,736	$ 19,375
% of Total	51.30%	50.80%
Corporate Debt Securities [Member] | Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 4,707	$ 4,281
Fixed maturity securities, available-for-sale	$ 3,855	$ 4,683
% of Total	11.80%	12.30%