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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-year | $ 13 |  |
Balance as of end of-year | 14 |  | $ 13
Accrued interest receivable on fixed maturity AFS securities | 1,100 |  | 1,000
Fixed Maturity AFS Securities [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-year | 13 |  |
Additions for securities for which credit losses were not previously recognized |  | 20 |
Additions from purchases of PCD debt securities |  |  |
Additions (reductions) for securities for which credit losses were previously recognized | 1 |  |
Balance as of end of-year | 14 | 20 | 13
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-year | 12 |  |
Additions for securities for which credit losses were not previously recognized |  | 20 |
Additions from purchases of PCD debt securities |  |  |
Additions (reductions) for securities for which credit losses were previously recognized | 1 |  |
Balance as of end of-year | 13 | 20 | 12
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-year | 1 |  |
Additions from purchases of PCD debt securities |  |  |
Balance as of end of-year | 1 |  | 1
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Balance as of beginning-of-year |  |  |
Additions from purchases of PCD debt securities |  |  |

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