v3.26.3
Mortgage Loans - Payment Status of Single-Family Restructured Loans Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Sep. 30, 2025
Single family    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months $ 28,207 $ 27,289
Single family | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 14,725 14,713
Single family | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 3,835 3,661
Single family | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 2,262 2,072
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 7,385 6,843
20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 27,482 26,454
20- and 30-year or more, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 14,372 14,293
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 3,739 3,551
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 2,195 2,008
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 7,176 6,602
15-year or less, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 551 649
15-year or less, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 279 339
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 74 88
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 49
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 149 173
Adjustable-rate and other    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 174 186
Adjustable-rate and other | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 74 81
Adjustable-rate and other | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 22 22
Adjustable-rate and other | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 18 15
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 $ 60 $ 68