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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Institutions
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]      
Obligation with Joint and Several Liability Arrangement, Amount Outstanding $ 904,900 $ 894,500  
Other liabilities 65 61  
FLA Balance For All Master Commitments 138 115  
Net Gains on Litigation Settlements 0 0 $ 21
Commitments to Issue Bonds [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 0 60  
Financial Standby Letter of Credit [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 62    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 757    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 819 675  
Number of Housing Authorities For Which the Bank Has Standby Bond Purchase Agreements | Institutions 7    
Original Expiration Periods Up To 7 years    
Commitments to Fund Advances [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year $ 527    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 527 50  
Standby Letters of Credit [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 10,025    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 168    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 10,193 9,094  
Guarantor Obligations, Term 13 years    
Other liabilities $ 2 2  
standby letters of credit issuance commitments [Domain]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 34 3  
Mortgage Receivable [Member] | Forward Contracts [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 127    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 127 $ 101