v3.25.3
Mortgage Loans - Payment Status of Single-Family Restructured Loans Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Single family    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months $ 27,289 $ 22,340
Single family | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 14,713 11,198
Single family | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 3,661 3,284
Single family | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 2,072 2,013
Single family | Three Months or More Past Due, or in Foreclosure(2)    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 6,843 5,845
20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 26,454 21,503
20- and 30-year or more, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 14,293 10,808
20- and 30-year or more, amortizing fixed-rate | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 3,551 3,161
20- and 30-year or more, amortizing fixed-rate | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 2,008 1,932
20- and 30-year or more, amortizing fixed-rate | Three Months or More Past Due, or in Foreclosure(2)    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 6,602 5,602
15-year or less, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 649 658
15-year or less, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 339 307
15-year or less, amortizing fixed-rate | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 88 98
15-year or less, amortizing fixed-rate | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 49 63
15-year or less, amortizing fixed-rate | Three Months or More Past Due, or in Foreclosure(2)    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 173 190
Adjustable-rate and other    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 186 179
Adjustable-rate and other | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 81 83
Adjustable-rate and other | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 22 25
Adjustable-rate and other | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 15 18
Adjustable-rate and other | Three Months or More Past Due, or in Foreclosure(2)    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months $ 68 $ 53