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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - Residential [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 133  
2019 396  
2018 201  
Total 730 $ 735
Performing [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 125  
2019 338  
2018 185  
Total 648 718
Nonperforming [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 8  
2019 58  
2018 16  
Total $ 82 $ 17