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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 | Jun. 30, 2021 | Dec. 31, 2020
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 33,687 | $ 31,963
Estimated Fair Value | $ 37,004 | $ 36,208
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 12,479 | $ 11,785
Estimated Fair Value | $ 13,627 | $ 13,236
% of Total | 36.80% | 36.60%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 17,032 | $ 16,274
Estimated Fair Value | $ 18,749 | $ 18,435
% of Total | 50.70% | 50.90%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 4,176 | $ 3,904
Estimated Fair Value | $ 4,628 | $ 4,537
% of Total | 12.50% | 12.50%

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