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Mortgage Loans - Loan Restructuring - Summary of Loans Restructured (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 17,131 $ 16,729 $ 35,989 $ 36,469
Restructured loans, percent of total financing receivable (* less than) 0.50% 0.50% 1.00% 1.00%
Restructured loans, paid off, repurchased or sold during period $ 324 $ 341 $ 1,300 $ 1,200
Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 6,177 5,488 9,766 8,815
Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,164 2,504 7,069 8,630
Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 5,269 5,479 9,301 9,709
Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,572 2,909 7,608 8,574
Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 949 349 2,245 741
Single-family        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 16,832 $ 16,140 $ 35,254 $ 35,744
Restructured loans, percent of total financing receivable (* less than) 0.50% 0.50% 1.00% 1.00%
Single-family | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 6,177 $ 5,014 $ 9,757 $ 8,228
Single-family | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,164 2,504 7,069 8,630
Single-family | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 5,269 5,479 9,301 9,709
Single-family | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,572 2,909 7,608 8,574
Single-family | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 650 234 1,519 603
Single-family | 20- and 30-year or more, amortizing fixed-rate        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 16,267 $ 15,553 $ 34,052 $ 34,448
Restructured loans, percent of total financing receivable (* less than) 1.00% 0.50% 1.00% 1.00%
Single-family | 20- and 30-year or more, amortizing fixed-rate | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 5,939 $ 4,809 $ 9,366 $ 7,866
Single-family | 20- and 30-year or more, amortizing fixed-rate | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,094 2,404 6,824 8,268
Single-family | 20- and 30-year or more, amortizing fixed-rate | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 5,093 5,277 8,964 9,312
Single-family | 20- and 30-year or more, amortizing fixed-rate | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 2,498 2,837 7,400 8,427
Single-family | 20- and 30-year or more, amortizing fixed-rate | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 643 226 1,498 575
Single-family | 15-year or less, amortizing fixed-rate        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 404 $ 420 $ 847 $ 890
Restructured loans, percent of total financing receivable (* less than) 0.50% 0.50% 0.50% 0.50%
Single-family | 15-year or less, amortizing fixed-rate | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 162 $ 155 $ 270 $ 272
Single-family | 15-year or less, amortizing fixed-rate | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 47 70 163 256
Single-family | 15-year or less, amortizing fixed-rate | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 133 140 245 269
Single-family | 15-year or less, amortizing fixed-rate | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 59 53 163 90
Single-family | 15-year or less, amortizing fixed-rate | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 3 2 6 3
Single-family | Adjustable-rate        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 63 $ 51 $ 118 $ 111
Restructured loans, percent of total financing receivable (* less than) 0.50% 0.50% 0.50% 0.50%
Single-family | Adjustable-rate | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 44 $ 26 $ 66 $ 45
Single-family | Adjustable-rate | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 5 6 24 27
Single-family | Adjustable-rate | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 14 18 27 34
Single-family | Adjustable-rate | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 0 0 0 0
Single-family | Adjustable-rate | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 0 1 1 5
Single-family | Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 98 $ 116 $ 237 $ 295
Restructured loans, percent of total financing receivable (* less than) 1.00% 1.00% 2.00% 2.00%
Single-family | Other | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 32 $ 24 $ 55 $ 45
Single-family | Other | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 18 24 58 79
Single-family | Other | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 29 44 65 94
Single-family | Other | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 15 19 45 57
Single-family | Other | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 4 5 14 20
Multifamily        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 299 $ 589 $ 735 $ 725
Restructured loans, percent of total financing receivable (* less than) 0.50% 0.50% 0.50% 0.50%
Multifamily | Forbearance Plan        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 0 $ 474 $ 9 $ 587
Multifamily | Payment Deferral        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 0 0 0 0
Multifamily | Trial Modification and Repayment Plans        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 0 0 0 0
Multifamily | Payment Delay and Term Extension        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost 0 0 0 0
Multifamily | Payment Delay, Term Extension, Interest Rate Reduction, and Other        
Loans in Mortgage Portfolio [Line Items]        
Restructured loans, amortized cost $ 299 $ 115 $ 726 $ 138