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Investments (Residential Mortgage Loans By Year Of Origination) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   $ 2,520
Amount originated in prior year   1,502
Amount originated 2 years prior   3,105
Amount originated 3 years prior   2,461
Amount originated 4 years prior   1,831
Amount originated 5 or more years prior   5,752
Total   17,171
Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year $ 134 469
Amount originated in prior year 577 131
Amount originated 2 years prior 116 210
Amount originated 3 years prior 187 109
Amount originated 4 years prior 91  
Total 1,105 919
Performing [Member] | Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year 134 467
Amount originated in prior year 574 129
Amount originated 2 years prior 113 189
Amount originated 3 years prior 170 104
Amount originated 4 years prior 88  
Total 1,079 889
Nonperforming [Member] | Residential [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   2
Amount originated in prior year 3 2
Amount originated 2 years prior 3 21
Amount originated 3 years prior 17 5
Amount originated 4 years prior 3  
Total $ 26 $ 30