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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | $ 1,536
Amount originated in prior year |  | 3,401
Amount originated 2 years prior |  | 2,583
Amount originated 3 years prior |  | 1,955
Amount originated 4 years prior |  | 1,909
Amount originated 5 or more years prior |  | 4,851
Total |  | 16,235
Residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | $ 242 | 184
Amount originated in prior year | 152 | 366
Amount originated 2 years prior | 246 | 187
Amount originated 3 years prior | 125 |
Total | 765 | 737
Performing [Member] | Residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 241 | 176
Amount originated in prior year | 149 | 315
Amount originated 2 years prior | 220 | 175
Amount originated 3 years prior | 121 |
Total | 731 | 666
Nonperforming [Member] | Residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 1 | 8
Amount originated in prior year | 3 | 51
Amount originated 2 years prior | 26 | 12
Amount originated 3 years prior | 4 |
Total | $ 34 | $ 71

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