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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 57,849 | $ 55,873
Fixed maturity securities, available-for-sale | 57,922 | 60,749
Corporate Debt Securities [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | 36,813 | 35,239
Fixed maturity securities, available-for-sale | $ 36,380 | $ 38,103
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 13,839 | $ 13,101
Fixed maturity securities, available-for-sale | $ 13,599 | $ 14,045
% of Total | 37.40% | 36.90%
Corporate Debt Securities [Member] | Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 18,496 | $ 17,857
Fixed maturity securities, available-for-sale | $ 18,382 | $ 19,375
% of Total | 50.50% | 50.80%
Corporate Debt Securities [Member] | Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 4,478 | $ 4,281
Fixed maturity securities, available-for-sale | $ 4,399 | $ 4,683
% of Total | 12.10% | 12.30%

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