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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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