v3.26.1
Commitments and Contingencies (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Loss Contingencies [Line Items]    
Obligation with Joint and Several Liability Arrangement, Amount Outstanding $ 1,131,700 $ 977,400
Other liabilities 635 73
Standby Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 20,840  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 123  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 20,963 18,263
Financial Standby Letter of Credit [Member]    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 205  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 1,079  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 1,284 1,249
Loan Origination Commitments [Member]    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 65  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 65 151
Commitments to Issue Discount Notes [Member]    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 370  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 370 3,060
Commitments to Issue Bonds    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year 4,505  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year 0  
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 4,505 1,000
Mortgages [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 127 106
standby letters of credit issuance commitments [Domain]    
Loss Contingencies [Line Items]    
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability $ 0 $ 0