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Fair Value Fair Value of Financial Instruments (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Carrying Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash $ 38,639,000,000 $ 48,223,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,750,000,000 38,975,000,000
Trading securities 31,795,000,000 30,768,000,000
Available-for-sale securities 37,128,000,000 38,171,000,000
Mortgage loans held for sale 1,494,000,000 380,000,000
Mortgage loans held for investment, at fair value 3,016,522,000,000 3,025,860,000,000
Advances to lenders 3,904,000,000 3,727,000,000
Derivatives assets at fair value 836,000,000 2,073,000,000
Guaranty assets and buy-ups 261,000,000 267,000,000
Total financial assets 3,143,329,000,000 3,188,444,000,000
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 25,000,000  
Derivative liabilities at fair value 209,000,000 1,469,000,000
Guaranty obligations 467,000,000 485,000,000
Total financial liabilities 3,195,396,000,000 3,236,477,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 29,239,000,000 36,633,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 17,587,000,000 16,306,000,000
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total financial assets 46,826,000,000 52,939,000,000
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0  
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 9,400,000,000 11,590,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,750,000,000 38,975,000,000
Trading securities 11,397,000,000 11,688,000,000
Available-for-sale securities 18,665,000,000 19,159,000,000
Mortgage loans held for sale 157,000,000 185,000,000
Mortgage loans held for investment, at fair value 2,616,855,000,000 2,599,667,000,000
Advances to lenders 3,362,000,000 3,165,000,000
Derivatives assets at fair value 9,160,000,000 10,430,000,000
Guaranty assets and buy-ups 0 0
Total financial assets 2,681,746,000,000 2,694,859,000,000
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 25,000,000  
Derivative liabilities at fair value 10,130,000,000 10,734,000,000
Guaranty obligations 0 0
Total financial liabilities 3,213,881,000,000 3,231,253,000,000
Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 2,811,000,000 2,774,000,000
Available-for-sale securities 18,463,000,000 19,012,000,000
Mortgage loans held for sale 1,345,000,000 195,000,000
Mortgage loans held for investment, at fair value 394,999,000,000 392,355,000,000
Advances to lenders 518,000,000 523,000,000
Derivatives assets at fair value 98,000,000 65,000,000
Guaranty assets and buy-ups 710,000,000 706,000,000
Total financial assets 418,944,000,000 415,630,000,000
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0  
Derivative liabilities at fair value 121,000,000 105,000,000
Guaranty obligations 2,107,000,000 2,433,000,000
Total financial liabilities 18,551,000,000 19,611,000,000
Netting Adjustment [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 0 0
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value (8,422,000,000) (8,422,000,000)
Guaranty assets and buy-ups 0 0
Total financial assets (8,422,000,000) (8,422,000,000)
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0  
Derivative liabilities at fair value (10,042,000,000) (9,370,000,000)
Guaranty obligations 0 0
Total financial liabilities (10,042,000,000) (9,370,000,000)
Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 38,639,000,000 48,223,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,750,000,000 38,975,000,000
Trading securities 31,795,000,000 30,768,000,000
Available-for-sale securities 37,128,000,000 38,171,000,000
Mortgage loans held for sale 1,502,000,000 380,000,000
Mortgage loans held for investment, at fair value 3,011,854,000,000 2,992,022,000,000
Advances to lenders 3,880,000,000 3,688,000,000
Derivatives assets at fair value 836,000,000 2,073,000,000
Guaranty assets and buy-ups 710,000,000 706,000,000
Total financial assets 3,139,094,000,000 3,155,006,000,000
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 25,000,000  
Derivative liabilities at fair value 209,000,000 1,469,000,000
Guaranty obligations 2,107,000,000 2,433,000,000
Total financial liabilities 3,222,390,000,000 3,241,494,000,000
Fannie Mae [Member]
   
Financial liabilities [Abstract]    
Long-term debt 1,775,000,000 1,308,000,000
Fannie Mae [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 251,899,000,000 259,638,000,000
Financial liabilities [Abstract]    
Short-term debt 65,448,000,000 72,295,000,000
Long-term debt 416,405,000,000 457,139,000,000
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 28,725,000,000 29,920,000,000
Financial liabilities [Abstract]    
Short-term debt 65,460,000,000 72,304,000,000
Long-term debt 426,479,000,000 463,991,000,000
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 213,181,000,000 215,960,000,000
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 906,000,000 1,557,000,000
Fannie Mae [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 241,906,000,000 245,880,000,000
Financial liabilities [Abstract]    
Short-term debt 65,460,000,000 72,304,000,000
Long-term debt 427,385,000,000 465,548,000,000
Consolidated Trusts [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 14,637,000,000 14,268,000,000
Financial liabilities [Abstract]    
Long-term debt 15,373,000,000 14,976,000,000
Consolidated Trusts [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,764,623,000,000 2,766,222,000,000
Financial liabilities [Abstract]    
Short-term debt 1,899,000,000 2,154,000,000
Long-term debt 2,710,943,000,000 2,702,935,000,000
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,588,130,000,000 2,569,747,000,000
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,711,787,000,000 2,684,224,000,000
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 181,818,000,000 176,395,000,000
Financial liabilities [Abstract]    
Short-term debt 1,899,000,000 2,154,000,000
Long-term debt 13,518,000,000 13,362,000,000
Consolidated Trusts [Member] | Netting Adjustment [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Consolidated Trusts [Member] | Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,769,948,000,000 2,746,142,000,000
Financial liabilities [Abstract]    
Short-term debt 1,899,000,000 2,154,000,000
Long-term debt 2,725,305,000,000 2,697,586,000,000
HARP loans [Member]
   
Financial liabilities [Abstract]    
Loans Receivable Refinanced under Home Affordable Refinance Program, Fair Value Disclosure 304,400,000,000 306,900,000,000
HARP loans [Member] | Fair Value Estimation Process [Member]
   
Financial Instruments [Line Items]    
Change In Estimated Fair Value Resulting From Change In Principal Market $ 11,100,000,000 $ 11,500,000,000