v3.26.1
Mortgage Loans - Amortized Cost Basis of Held-for-Investment Loans on Nonaccrual (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual $ 17,731 $ 16,674 $ 17,669 $ 16,033
Interest Income Recognized 49 46    
Single family        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual 17,681 16,467 17,442 15,908
Interest Income Recognized 49 45    
20- and 30-year or more, amortizing fixed-rate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual 17,002 15,724 16,739 15,157
Interest Income Recognized 48 43    
15-year or less, amortizing fixed-rate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual 462 487 482 511
Interest Income Recognized 1 1    
Adjustable-rate and other        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual 217 256 221 240
Interest Income Recognized 0 1    
Multifamily        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Excluding Accrued Interest, Nonaccrual 50 207 $ 227 $ 125
Interest Income Recognized $ 0 $ 1