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Fair Value Fair Value Option (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value of nonaccrual loans $ 215 $ 196
Difference between unpaid principal balance and the fair value of nonaccrual loans 67 74
Fair value of loans that are 90 days past due 272 288
Difference between unpaid principal balance and the fair value of these 90 days or more days past due loans 74 75
Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for investment, at fair value 15,262 14,268
Long-term debt, fair value 16,598 14,976
Fannie Mae [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 5,204 1,308
Interest-only debt instruments [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 120 85
Loans [Member] | Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for investment, at fair value 15,262 [1] 14,268 [1]
Loans, unpaid principal balance 14,829 [1] 14,440 [1]
Long-term debt [Member] | Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 16,598 [2] 14,976 [2]
Long-term debt, unpaid principal balance 15,229 [2] 13,988 [2]
Long-term debt [Member] | Fannie Mae [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 5,204 1,308
Long-term debt, unpaid principal balance $ 5,188 $ 1,290
Single-Family [Member] | Minimum [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Serious delinquency, days past due 90 days 90 days
[1] Includes nonaccrual loans with a fair value of $215 million and $196 million as of September 30, 2014 and December 31, 2013, respectively. The difference between unpaid principal balance and the fair value of these nonaccrual loans as of September 30, 2014 and December 31, 2013 was $67 million and $74 million, respectively. Includes loans that are 90 days or more past due with a fair value of $272 million and $288 million as of September 30, 2014 and December 31, 2013, respectively. The difference between unpaid principal balance and the fair value of these 90 or more days past due loans as of September 30, 2014 and December 31, 2013 was $74 million and $75 million, respectively.
[2] Includes interest-only debt instruments with no unpaid principal balance and a fair value of $120 million and $85 million as of September 30, 2014 and December 31, 2013, respectively.