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Fair Value Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash $ 80,713 $ 68,336
Federal funds sold and purchased under agreements to resell or similar aggrangements 24,000 46,000
Trading securities 50,935 74,198
Available-for-sale securities 69,694 77,582
Mortgage loans held for sale 455 311
Mortgage loans held for investment 2,922,787 2,898,310
Advances to lenders 7,343 5,538
Derivatives assets at fair value 602 561
Guaranty assets and buy-ups 474 503
Total financial assets 3,157,003 3,171,339
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 153 0
Derivative liabilities at fair value 919 916
Guaranty obligations 758 811
Total financial liabilities 3,165,718 3,191,599
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 68,663  
Federal funds sold and purchased under agreements to resell or similar aggrangements 0  
Trading securities 27,064  
Available-for-sale securities 0  
Mortgage loans held for sale 0  
Mortgage loans held for investment 0  
Advances to lenders 0  
Derivatives assets at fair value 0  
Guaranty assets and buy-ups 0  
Total financial assets 95,727  
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value 0  
Guaranty obligations 0  
Total financial liabilities 0  
Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 12,050  
Federal funds sold and purchased under agreements to resell or similar aggrangements 24,000  
Trading securities 21,566  
Available-for-sale securities 43,366  
Mortgage loans held for sale 280  
Mortgage loans held for investment 2,441,818  
Advances to lenders 6,638  
Derivatives assets at fair value 16,718  
Guaranty assets and buy-ups 0  
Total financial assets 2,566,436  
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 153  
Derivative liabilities at fair value 24,282  
Guaranty obligations 0  
Total financial liabilities 3,337,177  
Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0  
Federal funds sold and purchased under agreements to resell or similar aggrangements 0  
Trading securities 2,305  
Available-for-sale securities 26,328  
Mortgage loans held for sale 187  
Mortgage loans held for investment 523,752  
Advances to lenders 615  
Derivatives assets at fair value 236  
Guaranty assets and buy-ups 866  
Total financial assets 554,289  
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value 162  
Guaranty obligations 3,543  
Total financial liabilities 24,551  
Netting Adjustment [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0  
Federal funds sold and purchased under agreements to resell or similar aggrangements 0  
Trading securities 0  
Available-for-sale securities 0  
Mortgage loans held for sale 0  
Mortgage loans held for investment 0  
Advances to lenders 0  
Derivatives assets at fair value (16,352)  
Guaranty assets and buy-ups 0  
Total financial assets (16,352)  
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Derivative liabilities at fair value (23,525)  
Guaranty obligations 0  
Total financial liabilities (23,525)  
Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 80,713 68,336
Federal funds sold and purchased under agreements to resell or similar aggrangements 24,000 46,000
Trading securities 50,935 74,198
Available-for-sale securities 69,694 77,582
Mortgage loans held for sale 467 325
Mortgage loans held for investment 2,965,570 2,947,021
Advances to lenders 7,253 5,420
Derivatives assets at fair value 602 561
Guaranty assets and buy-ups 866 901
Total financial assets 3,200,100 3,220,344
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 153 0
Derivative liabilities at fair value 919 916
Guaranty obligations 3,543 3,944
Total financial liabilities 3,338,203 3,367,255
Fannie Mae [Member]
   
Financial liabilities [Abstract]    
Long-term debt 831 838
Fannie Mae [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 317,578 322,825
Financial liabilities [Abstract]    
Short-term debt 92,906 146,752
Long-term debt 566,483 585,692
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 0  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 0  
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 36,665  
Financial liabilities [Abstract]    
Short-term debt 92,917  
Long-term debt 592,491  
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 230,096  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 1,074  
Fannie Mae [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 0  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 0  
Fannie Mae [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 266,761 294,996
Financial liabilities [Abstract]    
Short-term debt 92,917 146,782
Long-term debt 593,565 613,983
Consolidated Trusts [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 5,231 3,611
Financial liabilities [Abstract]    
Long-term debt 4,600 3,939
Consolidated Trusts [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 2,605,209 2,575,485
Financial liabilities [Abstract]    
Short-term debt 3,908 4,973
Long-term debt 2,500,591 2,452,455
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 0  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 0  
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 2,405,153  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 2,627,334  
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 293,656  
Financial liabilities [Abstract]    
Short-term debt 3,908  
Long-term debt 15,864  
Consolidated Trusts [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 0  
Financial liabilities [Abstract]    
Short-term debt 0  
Long-term debt 0  
Consolidated Trusts [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment 2,698,809 2,652,025
Financial liabilities [Abstract]    
Short-term debt 3,908 4,973
Long-term debt $ 2,643,198 $ 2,596,657