v3.25.3
Mortgage Loans - Single-Family Loan Restructurings Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
financing receivable, loan restructuring [Line Items]        
Amortized cost basis of SF HFI loans in trial period modification plans $ 3,500 $ 2,000 $ 3,500 $ 2,000
Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 8,019 $ 7,429 $ 22,106 $ 18,343
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.30% 0.20% 0.70% 0.60%
Amortized cost basis of loans in payment deferral plans $ 2,000 $ 1,700 $ 6,800 $ 6,100
20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 7,783 $ 7,155 $ 21,455 $ 17,670
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.30% 0.30% 0.80% 0.60%
15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 173 $ 213 $ 498 $ 526
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.10% 0.10% 0.20% 0.20%
Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 63 $ 61 $ 153 $ 147
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.20% 0.20% 0.50% 0.50%
payment delay [Member] | Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 5,576 $ 5,867 $ 15,393 $ 14,033
payment delay [Member] | 20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 5,347 5,597 14,759 13,370
payment delay [Member] | 15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 172 213 496 526
payment delay [Member] | Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 57 57 138 137
payment delay and term extension [Member] | Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 2,189 1,536 6,088 4,265
payment delay and term extension [Member] | 20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 2,183 1,533 6,073 4,256
payment delay and term extension [Member] | 15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 1 0 2 0
payment delay and term extension [Member] | Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 5 3 13 9
payment delay, interest rate reduction, and term extension [Member] | Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 254 26 625 45
payment delay, interest rate reduction, and term extension [Member] | 20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 253 25 623 44
payment delay, interest rate reduction, and term extension [Member] | 15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0 0 0 0
payment delay, interest rate reduction, and term extension [Member] | Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 1 $ 1 $ 2 $ 1