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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Institutions
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]      
Obligation with Joint and Several Liability Arrangement, Amount Outstanding $ 1,057,700   $ 904,900
Other liabilities 207   65
FLA Balance For All Master Commitments 142   138
Gains on litigation settlements, net 56 $ 0  
Standby Letters of Credit [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 9,530    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 121    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 9,651   10,193
Standby Letters of Credit Original Terms 13 years    
Other liabilities $ 2   2
Financial Standby Letter of Credit [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 42    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 774    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 816   819
Original Expiration Periods Up To 7 years    
Number of Housing Authorities For Which the Bank Has Standby Bond Purchase Agreements | Institutions 7    
Commitments to Issue Bonds [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year $ 133    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 133   0
Loan Origination Commitments [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 954    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 954   527
Mortgages [Member] | Forward Contracts [Member]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 348    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 348   127
standby letters of credit issuance commitments [Domain]      
Loss Contingencies [Line Items]      
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 9   $ 34