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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