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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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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%

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