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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 54,347	$ 49,548
Fixed maturity securities, available-for-sale	59,289	56,735
Corporate Debt Securities [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 34,331	$ 31,963
% of Total	100.00%	100.00%
Fixed maturity securities, available-for-sale	$ 37,329	$ 36,208
Corporate Debt Securities [Member] | Financial Services Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 12,657	$ 11,785
% of Total	36.70%	36.60%
Fixed maturity securities, available-for-sale	$ 13,693	$ 13,236
Corporate Debt Securities [Member] | Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 17,523	$ 16,274
% of Total	51.10%	50.90%
Fixed maturity securities, available-for-sale	$ 19,080	$ 18,435
Corporate Debt Securities [Member] | Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 4,151	$ 3,904
% of Total	12.20%	12.50%
Fixed maturity securities, available-for-sale	$ 4,556	$ 4,537

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-Publisher FASB
-Name Accounting Standards Codification
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