v3.26.1
Mortgage Loans - Payment Status of Single-Family Restructured Loans Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Single family    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months $ 28,532 $ 26,051
Single family | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 15,592 13,160
Single family | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 3,617 3,273
Single family | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 2,092 2,084
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 7,231 7,534
20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 27,735 25,141
20- and 30-year or more, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 15,192 12,733
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 3,506 3,159
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 2,029 2,000
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 7,008 7,249
15-year or less, amortizing fixed-rate    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 607 718
15-year or less, amortizing fixed-rate | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 309 347
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 86 97
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 50 66
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 162 208
Adjustable-rate and other    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 190 192
Adjustable-rate and other | Current    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 91 80
Adjustable-rate and other | One Month Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 25 17
Adjustable-rate and other | Two Months Past Due    
Financing Receivable, Modified [Line Items]    
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months 13 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 $ 61 $ 77