v3.25.2
Mortgage Loans - Subsequent Defaults of Single-Family Restructured Loans Involving Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default $ 1,691 $ 1,396 $ 3,074 $ 2,425
Single family | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 1,031 994 1,892 1,691
Single family | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 636 399 1,150 726
Single family | payment delay, interest rate reduction, and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 24 3 32 8
20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 1,652 1,353 2,996 2,353
20- and 30-year or more, amortizing fixed-rate | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 993 952 1,816 1,620
20- and 30-year or more, amortizing fixed-rate | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 635 398 1,148 725
20- and 30-year or more, amortizing fixed-rate | payment delay, interest rate reduction, and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 24 3 32 8
15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 30 34 60 55
15-year or less, amortizing fixed-rate | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 30 34 60 55
15-year or less, amortizing fixed-rate | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 0 0 0 0
15-year or less, amortizing fixed-rate | payment delay, interest rate reduction, and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 0 0 0 0
Adjustable-rate and other        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 9 9 18 17
Adjustable-rate and other | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 8 8 16 16
Adjustable-rate and other | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 1 1 2 1
Adjustable-rate and other | payment delay, interest rate reduction, and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default $ 0 $ 0 $ 0 $ 0