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Investments (Commercial Mortgage Loans By Year Of Origination) (Details)
$ in Millions
Mar. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
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
Loan-to-value ratio, less than 65% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   2,384
Amount originated in prior year   1,358
Amount originated 2 years prior   2,917
Amount originated 3 years prior   2,274
Amount originated 4 years prior   1,655
Amount originated 5 or more years prior   5,554
Total   $ 16,142
Ratio of originations in current year | item   3.04
Ratio of originations in prior year | item   3.03
Ratio of originations 2 years prior | item   2.15
Ratio of originations 3 years prior | item   2.13
Ratio of originations 4 years prior | item   2.33
Ratio of originations 5 or more years prior | item   2.41
Loan-to-value ratio, 65% to 74% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year   $ 136
Amount originated in prior year   144
Amount originated 2 years prior   188
Amount originated 3 years prior   172
Amount originated 4 years prior   149
Amount originated 5 or more years prior   171
Total   $ 960
Ratio of originations in current year | item   1.74
Ratio of originations in prior year | item   2.06
Ratio of originations 2 years prior | item   1.42
Ratio of originations 3 years prior | item   1.59
Ratio of originations 4 years prior | item   1.74
Ratio of originations 5 or more years prior | item   1.76
Loan-to-value ratio, 75% to 100% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated 3 years prior   $ 15
Amount originated 4 years prior   27
Amount originated 5 or more years prior   27
Total   $ 69
Ratio of originations 3 years prior | item   1.02
Ratio of originations 4 years prior | item   0.83
Ratio of originations 5 or more years prior | item   1.08
Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year $ 354  
Amount originated in prior year 2,465  
Amount originated 2 years prior 1,375  
Amount originated 3 years prior 2,878  
Amount originated 4 years prior 2,408  
Amount originated 5 or more years prior 7,390  
Total 16,870  
Commercial [Member] | Loan-to-value ratio, less than 65% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year 329  
Amount originated in prior year 2,378  
Amount originated 2 years prior 1,355  
Amount originated 3 years prior 2,700  
Amount originated 4 years prior 2,238  
Amount originated 5 or more years prior 7,040  
Total $ 16,040  
Ratio of originations in current year | item 2.67  
Ratio of originations in prior year | item 3.05  
Ratio of originations 2 years prior | item 2.98  
Ratio of originations 3 years prior | item 2.15  
Ratio of originations 4 years prior | item 2.14  
Ratio of originations 5 or more years prior | item 2.37  
Commercial [Member] | Loan-to-value ratio, 65% to 74% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated in current year $ 25  
Amount originated in prior year 87  
Amount originated 2 years prior 20  
Amount originated 3 years prior 178  
Amount originated 4 years prior 155  
Amount originated 5 or more years prior 302  
Total $ 767  
Ratio of originations in current year | item 1.57  
Ratio of originations in prior year | item 1.50  
Ratio of originations 2 years prior | item 1.55  
Ratio of originations 3 years prior | item 1.56  
Ratio of originations 4 years prior | item 1.56  
Ratio of originations 5 or more years prior | item 1.77  
Commercial [Member] | Loan-to-value ratio, 75% to 100% [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Amount originated 4 years prior $ 15  
Amount originated 5 or more years prior 48  
Total $ 63  
Ratio of originations 4 years prior | item 1.02  
Ratio of originations 5 or more years prior | item 0.99