v3.25.3
Mortgage Loans - Subsequent Defaults of Single-Family Restructured Loans 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
Single family        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default $ 2,067 $ 1,772 $ 4,705 $ 3,784
Single family | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 1,164 1,223 2,798 2,628
Single family | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 834 544 1,811 1,145
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 69 5 96 11
20- and 30-year or more, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 2,029 1,715 4,607 3,671
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 1,128 1,166 2,703 2,516
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 832 544 1,808 1,144
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 69 5 96 11
15-year or less, amortizing fixed-rate        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 29 44 75 86
15-year or less, amortizing fixed-rate | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 29 44 75 86
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 13 23 27
Adjustable-rate and other | payment delay [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 7 13 20 26
Adjustable-rate and other | payment delay and term extension [Member]        
financing receivable, loan restructuring [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 2 0 3 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