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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 31,963	$ 29,205
Available-for-sale Securities	$ 36,208	$ 31,393
Percentage Of Total Available For Sales Securities	100.00%	100.00%
Financial Services Sector [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 11,785	$ 10,896
Available-for-sale Securities	$ 13,236	$ 11,653
Percentage Of Total Available For Sales Securities	36.60%	37.20%
Commercial and Industrial Sector [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 16,274	$ 14,692
Available-for-sale Securities	$ 18,435	$ 15,803
Percentage Of Total Available For Sales Securities	50.90%	50.30%
Utility Industry [Member]
Corporate Secturities by Investment Sector And Credit Rating [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 3,904	$ 3,617
Available-for-sale Securities	$ 4,537	$ 3,937
Percentage Of Total Available For Sales Securities	12.50%	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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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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