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Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Commitments | Commercial Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Allowance for credit losses $ 2 $ 2    
Change in allowance for credit losses 0 (1)    
Purchase Investments        
Commitments and Contingent Liabilities [Line Items]        
Change in allowance for credit losses 0 $ 0    
Indemnification | Securities Lending and Securities Repurchase Transactions        
Commitments and Contingent Liabilities [Line Items]        
Guarantor Obligations, Liquidation Proceeds, Percentage   102.00%    
Indemnification | Securities Repurchase Transactions        
Commitments and Contingent Liabilities [Line Items]        
Guarantor Obligations, Liquidation Proceeds, Percentage   95.00%    
Indemnification | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Allowance for credit losses 17 $ 17    
Change in allowance for credit losses 0 (1)    
Mortgages subject to loss-sharing arrangements $ 18,154 $ 18,154   $ 16,878
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements 1.96 1.96   1.88
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements 62.00% 62.00%   61.00%
Losses related to indemnifications that were settled   $ 0 $ 0  
Indemnification | Minimum | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Percentage share of losses incurred on certain loans serviced   4.00%    
Indemnification | Maximum | Serviced Mortgage Loans        
Commitments and Contingent Liabilities [Line Items]        
Percentage share of losses incurred on certain loans serviced   20.00%    
Yield Maintenance Guarantee        
Commitments and Contingent Liabilities [Line Items]        
Guarantees related to certain investments the Company sold $ 9 $ 9   $ 12