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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - Corporate Debt Securities [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 32,916 | $ 31,963
Estimated Fair Value | $ 35,295 | $ 36,208
% of Total | 100.00% | 100.00%
Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 12,045 | $ 11,785
Estimated Fair Value | $ 12,906 | $ 13,236
% of Total | 36.60% | 36.60%
Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 16,819 | $ 16,274
Estimated Fair Value | $ 18,029 | $ 18,435
% of Total | 51.00% | 50.90%
Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 4,052 | $ 3,904
Estimated Fair Value | $ 4,360 | $ 4,537
% of Total | 12.40% | 12.50%

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