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Investments (Investment Income Adjustment) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships	$ 92
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships	$ 70
Revision of Prior Period, Reclassification, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		$ 102	$ (2)	$ 1	$ 10

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Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships

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Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Investments in Limited Partnerships and private equity funds for which it utilizes the equity method of accounting.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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