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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - USD ($) $ in Millions | Jun. 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 | $ 148 | 184
Amount originated in prior year | 179 | 366
Amount originated 2 years prior | 293 | 187
Amount originated 3 years prior | 142 |
Total | 762 | 737
Performing [Member] | Residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year | 148 | 176
Amount originated in prior year | 175 | 315
Amount originated 2 years prior | 262 | 175
Amount originated 3 years prior | 136 |
Total | 721 | 666
Nonperforming [Member] | Residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount originated in current year |  | 8
Amount originated in prior year | 4 | 51
Amount originated 2 years prior | 31 | 12
Amount originated 3 years prior | 6 |
Total | $ 41 | $ 71

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