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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 | $ 73 |
2019 | 472 |
2018 | 229 |
Total | 774 | $ 735
Performing [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 | 73 |
2019 | 454 |
2018 | 223 |
Total | 750 | 718
Nonperforming [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2019 | 18 |
2018 | 6 |
Total | $ 24 | $ 17

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