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Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Commitments | Commercial Mortgage Loans      
Commitments and Contingent Liabilities [Line Items]      
Allowance or related charges for credit losses $ 0    
Purchase Investments      
Commitments and Contingent Liabilities [Line Items]      
Allowance or related charges for credit losses $ 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 or related charges for credit losses $ 1    
Mortgages subject to loss-sharing arrangements $ 17,243   $ 16,878
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements 1.92   1.88
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements 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 $ 12   $ 12