v3.26.1
Mortgage Loans - Amortized Cost Basis of Held-for-Investment Loans on Nonaccrual (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual $ 18,190 $ 16,277 $ 18,190 $ 16,277 $ 17,731 $ 16,674
Interest Income Recognized 51 45 128 112    
Single family            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 18,004 16,098 18,004 16,098 17,681 16,467
Interest Income Recognized 51 45 128 111    
20- and 30-year or more, amortizing fixed-rate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 17,340 15,376 17,340 15,376 17,002 15,724
Interest Income Recognized 49 43 124 107    
15-year or less, amortizing fixed-rate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 449 480 449 480 462 487
Interest Income Recognized 1 1 2 2    
Adjustable-rate and other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 215 242 215 242 217 256
Interest Income Recognized 1 1 2 2    
Multifamily            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 186 179 186 179 $ 50 $ 207
Interest Income Recognized $ 0 $ 0 $ 0 $ 1