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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, 2020 | Dec. 31, 2019
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 29,203 | $ 29,205
Estimated Fair Value | $ 29,494 | $ 31,393
% of Total | 100.00% | 100.00%
Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 10,979 | $ 10,896
Estimated Fair Value | $ 11,056 | $ 11,653
% of Total | 37.50% | 37.20%
Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 14,703 | $ 14,692
Estimated Fair Value | $ 14,756 | $ 15,803
% of Total | 50.00% | 50.30%
Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 3,521 | $ 3,617
Estimated Fair Value | $ 3,682 | $ 3,937
% of Total | 12.50% | 12.50%

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