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MPF Loans Held in Portfolio (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
MPF Loans held in portfolio, net $ 12,381 $ 11,410
Conventional mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
MPF Loans held in portfolio, before allowance for credit losses 11,634 10,650
MPF Loans held in portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance 12,232 11,270
Net premiums, credit enhancement, and/or deferred loan fees 178 168
Fair value hedging and delivery commitment basis adjustments (24) (23)
MPF Loans held in portfolio, before allowance for credit losses 12,386 11,415
Allowance for credit losses on MPF Loans (5) (5)
MPF Loans held in portfolio, net 12,381 11,410
MPF Loans held in portfolio | Medium term (15 years or less)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance 1,426 1,450
MPF Loans held in portfolio | Long term (greater than 15 years)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance 10,806 9,820
MPF Loans held in portfolio | Conventional mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance 11,489 10,514
MPF Loans held in portfolio | Government Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance $ 743 $ 756