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Commitments and Contingent Liabilities (Narrative Excluding Litigation) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Indemnification | Securities Lending 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 | Commercial Mortgage Loans      
Commitments and Contingent Liabilities [Line Items]      
Mortgages subject to loss-sharing arrangements $ 16,878 $ 14,335  
Weighted-average debt service coverage ratio of mortgages subject to loss-sharing arrangements 1.88 1.83  
Weighted-average loan-to-value ratio of mortgages subject to loss-sharing arrangements 61.00% 62.00%  
Losses related to indemnification that were settled $ 0 $ 0 $ 0
Indemnification | Minimum | Commercial Mortgage Loans      
Commitments and Contingent Liabilities [Line Items]      
Percentage share of losses incurred on certain loans serviced 2.00%    
Indemnification | Maximum | Commercial 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 $ 13