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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 | Sep. 30, 2020 | Dec. 31, 2019
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 31,044 | $ 29,205
Estimated Fair Value | $ 34,259 | $ 31,393
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 11,550 | $ 10,896
Estimated Fair Value | $ 12,658 | $ 11,653
% of Total | 37.00% | 37.20%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 15,709 | $ 14,692
Estimated Fair Value | $ 17,280 | $ 15,803
% of Total | 50.40% | 50.30%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 3,785 | $ 3,617
Estimated Fair Value | $ 4,321 | $ 3,937
% of Total | 12.60% | 12.50%

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