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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
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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Percentage of available for sale securities

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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