v3.26.3
Mortgage Loans - Amortized Cost Basis of Held-for-Investment Loans on Nonaccrual (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual $ 18,710 $ 16,371 $ 18,710 $ 16,371 $ 17,669 $ 16,033
Interest Income Recognized 51 46 253 213    
Single family            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 18,511 16,114 18,511 16,114 17,442 15,908
Interest Income Recognized 51 45 252 211    
20- and 30-year or more, amortizing fixed-rate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 17,858 15,430 17,858 15,430 16,739 15,157
Interest Income Recognized 49 43 244 204    
15-year or less, amortizing fixed-rate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 439 462 439 462 482 511
Interest Income Recognized 1 1 5 4    
Adjustable-rate and other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 214 222 214 222 221 240
Interest Income Recognized 1 1 3 3    
Multifamily            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Excluding Accrued Interest, Nonaccrual 199 257 199 257 $ 227 $ 125
Interest Income Recognized $ 0 $ 1 $ 1 $ 2