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Fair Value Fair Value Option (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value of nonaccrual loans $ 323 $ 273
Difference between unpaid principal balance and the fair value of nonaccrual loans 127 189
Fair value of loans that are 90 days past due 434 386
Difference between unpaid principal balance and the fair value of these 90 days or more days past due loans 135 201
Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for investment, at amortized cost 12,602 10,800
Long-term debt, fair value 13,345 11,647
Loans, Unpaid principal balance 2,631,689 2,607,880
Fannie Mae [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 770 793
Loans, Unpaid principal balance 350,959 370,354
Interest-only debt instruments [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 93 100
Loans [Member] | Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans held for investment, at amortized cost 12,602 [1] 10,800 [1]
Loans, Unpaid principal balance 12,436 [1] 10,657 [1]
Long-term Debt [Member] | Consolidated Trusts [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 13,345 [2] 11,647 [2]
Long-Term Debt, Unpaid principal balance 12,346 [2] 10,803 [2]
Long-term Debt [Member] | Fannie Mae [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 770 793
Long-Term Debt, Unpaid principal balance $ 674 $ 674
[1] Includes nonaccrual loans with a fair value of $323 million and $273 million as of March 31, 2013 and December 31, 2012, respectively. The difference between unpaid principal balance and the fair value of these nonaccrual loans as of March 31, 2013 and December 31, 2012 is $127 million and $189 million, respectively. Includes loans that are 90 days or more past due with a fair value of $434 million and $386 million as of March 31, 2013 and December 31, 2012, respectively. The difference between unpaid principal balance and the fair value of these 90 or more days past due loans as of March 31, 2013 and December 31, 2012 is $135 million and $201 million, respectively.
[2] Includes interest-only debt instruments with no unpaid principal balance and a fair value of $93 million and $100 million as of March 31, 2013 and December 31, 2012, respectively.