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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 469,000,000 | $ 184,000,000
Amount originated in prior year | 131,000,000 | 366,000,000
Amount originated 2 years prior | 210,000,000 | 187,000,000
Amount originated 3 years prior | 109,000,000 |
Total | 919,000,000 | 737,000,000
Performing [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 467,000,000 | 176,000,000
Amount originated in prior year | 129,000,000 | 315,000,000
Amount originated 2 years prior | 189,000,000 | 175,000,000
Amount originated 3 years prior | 104,000,000 |
Total | 889,000,000 | 666,000,000
Nonperforming [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 2,000,000 | 8,000,000
Amount originated in prior year | 2,000,000 | 51,000,000
Amount originated 2 years prior | 21,000,000 | 12,000,000
Amount originated 3 years prior | 5,000,000 |
Total | $ 30,000,000 | $ 71,000,000

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