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Investments (Commercial Mortgage Loans By Year Of Origination) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
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
Loan-to-value ratio, less than 65% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   1,504
Amount originated in prior year   3,141
Amount originated 2 years prior   2,382
Amount originated 3 years prior   1,786
Amount originated 4 years prior   1,713
Amount originated 5 or more years prior   4,710
Total   $ 15,236
Ratio of originations in current year | item   2.86
Ratio of originations in prior year | item   2.25
Ratio of originations 2 years prior | item   2.16
Ratio of originations 3 years prior | item   2.34
Ratio of originations 4 years prior | item   2.37
Ratio of originations 5 or more years prior | item   2.38
Loan-to-value ratio, 65% to 74% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   $ 32
Amount originated in prior year   258
Amount originated 2 years prior   186
Amount originated 3 years prior   169
Amount originated 4 years prior   174
Amount originated 5 or more years prior   133
Total   $ 952
Ratio of originations in current year | item   1.52
Ratio of originations in prior year | item   1.78
Ratio of originations 2 years prior | item   1.49
Ratio of originations 3 years prior | item   1.73
Ratio of originations 4 years prior | item   1.56
Ratio of originations 5 or more years prior | item   1.95
Loan-to-value ratio, 75% to 100% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in prior year   $ 2
Amount originated 2 years prior   15
Amount originated 4 years prior   22
Amount originated 5 or more years prior   8
Total   $ 47
Ratio of originations in prior year | item   1.74
Ratio of originations 2 years prior | item   0.71
Ratio of originations 4 years prior | item   1.58
Ratio of originations 5 or more years prior | item   1.02
Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year $ 1,379  
Amount originated in prior year 1,514  
Amount originated 2 years prior 3,351  
Amount originated 3 years prior 2,515  
Amount originated 4 years prior 1,910  
Amount originated 5 or more years prior 6,329  
Total 16,998  
Commercial [Member] | Loan-to-value ratio, less than 65% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year 1,298  
Amount originated in prior year 1,370  
Amount originated 2 years prior 3,037  
Amount originated 3 years prior 2,319  
Amount originated 4 years prior 1,732  
Amount originated 5 or more years prior 6,059  
Total $ 15,815  
Ratio of originations in current year | item 3.07  
Ratio of originations in prior year | item 3.02  
Ratio of originations 2 years prior | item 2.19  
Ratio of originations 3 years prior | item 2.14  
Ratio of originations 4 years prior | item 2.32  
Ratio of originations 5 or more years prior | item 2.39  
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year $ 81  
Amount originated in prior year 104  
Amount originated 2 years prior 290  
Amount originated 3 years prior 181  
Amount originated 4 years prior 151  
Amount originated 5 or more years prior 232  
Total $ 1,039  
Ratio of originations in current year | item 1.91  
Ratio of originations in prior year | item 1.46  
Ratio of originations 2 years prior | item 1.78  
Ratio of originations 3 years prior | item 1.50  
Ratio of originations 4 years prior | item 1.75  
Ratio of originations 5 or more years prior | item 1.75  
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in prior year $ 40  
Amount originated 2 years prior 24  
Amount originated 3 years prior 15  
Amount originated 4 years prior 27  
Amount originated 5 or more years prior 38  
Total $ 144  
Ratio of originations in prior year | item 2.21  
Ratio of originations 2 years prior | item 1.79  
Ratio of originations 3 years prior | item 1.02  
Ratio of originations 4 years prior | item 0.96  
Ratio of originations 5 or more years prior | item 1.23