XML 173 R93.htm IDEA: XBRL DOCUMENT v3.25.0.1
Fair Value - Fair Value Option (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Inputs, Quantitative Information [Line Items]      
Total multifamily mortgage loans held for investment, at amortized cost $ 3,744 $ 3,315  
Fair value of nonaccrual loans $ 31 32  
Serious delinquency: days past due 90 days    
Fair value of loans that are 90 days past due $ 25 31  
Changes in fair value, gain (loss) 1,821 1,304 $ 1,284
Fannie Mae      
Fair Value Inputs, Quantitative Information [Line Items]      
Long-term debt 385 761  
Consolidated Trusts      
Fair Value Inputs, Quantitative Information [Line Items]      
Long-term debt 13,292 14,343  
Loans      
Fair Value Inputs, Quantitative Information [Line Items]      
Total multifamily mortgage loans held for investment, at amortized cost 3,744 3,315  
Loans, unpaid principal balance 4,079 3,442  
Changes in fair value, gain (loss) (26) 108 (503)
Long-term Debt      
Fair Value Inputs, Quantitative Information [Line Items]      
Changes in fair value, gain (loss) 59 (308) $ 2,300
Long-term Debt | Fannie Mae      
Fair Value Inputs, Quantitative Information [Line Items]      
Long-term debt 385 761  
Debt, unpaid principal balance 383 731  
Long-term Debt | Consolidated Trusts      
Fair Value Inputs, Quantitative Information [Line Items]      
Long-term debt 13,292 14,343  
Debt, unpaid principal balance $ 13,766 $ 14,383