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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 | $ 133 |
2019 | 396 |
2018 | 201 |
Total | 730 | $ 735
Performing [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 | 125 |
2019 | 338 |
2018 | 185 |
Total | 648 | 718
Nonperforming [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 | 8 |
2019 | 58 |
2018 | 16 |
Total | $ 82 | $ 17

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