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Financing Receivables (Allowance for Loan Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Rollforward of the allowance for loan losses      
Recovery   $ 1 $ 0
Commercial Loan      
Rollforward of the allowance for loan losses      
Beginning balance $ 51 [1] 49 49
Provisions 19 5 6
Charge-offs (6) (4) (6)
Ending balance 66 51 [1] 49
Recorded investment in financing receivables by impairment method and type of loan      
Interest Receivable 16 14  
Commercial Loan | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Rollforward of the allowance for loan losses      
Beginning balance 2    
Ending balance   2  
Commercial Loan | Cumulative Effect, Period of Adoption, Adjusted Balance      
Rollforward of the allowance for loan losses      
Beginning balance 53    
Ending balance   53  
Consumer Loan      
Rollforward of the allowance for loan losses      
Beginning balance [1] 0    
Provisions 2    
Charge-offs (3)    
Ending balance 2 0 [1]  
Consumer Loan | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Rollforward of the allowance for loan losses      
Beginning balance 3    
Ending balance   3  
Consumer Loan | Cumulative Effect, Period of Adoption, Adjusted Balance      
Rollforward of the allowance for loan losses      
Beginning balance 3    
Ending balance   3  
Total Segment [Member]      
Rollforward of the allowance for loan losses      
Beginning balance [1] 51    
Provisions 21    
Charge-offs (9)    
Ending balance 68 51 [1]  
Total Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Rollforward of the allowance for loan losses      
Beginning balance 5    
Ending balance   5  
Total Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance      
Rollforward of the allowance for loan losses      
Beginning balance 56    
Ending balance   56  
Syndicated loans [Member]      
Recorded investment in financing receivables by impairment method and type of loan      
Loans purchased 173 162 221
Loans sold 17 54 $ 51
Residential Mortgage      
Recorded investment in financing receivables by impairment method and type of loan      
Loans purchased 22    
Collateral Pledged      
Recorded investment in financing receivables by impairment method and type of loan      
Loans purchased 224    
Commercial mortgage loans [Member]      
Rollforward of the allowance for loan losses      
Beginning balance 19    
Ending balance $ 29 $ 19  
[1] Prior to January 1, 2020, the allowance for credit losses was based on an incurred loss model that did not require estimating expected credit losses over the expected life of the asset.