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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