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Fair Value Fair Value of Financial Instruments (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Carrying Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash $ 44,847,000,000 $ 48,223,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 29,450,000,000 38,975,000,000
Trading securities 30,844,000,000 30,768,000,000
Available-for-sale securities 32,099,000,000 38,171,000,000
Mortgage loans held for sale 368,000,000 380,000,000
Mortgage loans held for investment, at fair value 3,009,835,000,000 3,025,860,000,000
Advances to lenders 4,881,000,000 3,727,000,000
Derivatives assets at fair value 1,256,000,000 2,073,000,000
Guaranty assets and buy-ups 223,000,000 267,000,000
Total financial assets 3,153,803,000,000 3,188,444,000,000
Financial liabilities [Abstract]    
Derivative liabilities at fair value 443,000,000 1,469,000,000
Guaranty obligations 404,000,000 485,000,000
Total financial liabilities 3,202,327,000,000 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 34,347,000,000 36,633,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 17,757,000,000 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 52,104,000,000 52,939,000,000
Financial liabilities [Abstract]    
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 10,500,000,000 11,590,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 29,450,000,000 38,975,000,000
Trading securities 9,959,000,000 11,688,000,000
Available-for-sale securities 16,202,000,000 19,159,000,000
Mortgage loans held for sale 164,000,000 185,000,000
Mortgage loans held for investment, at fair value 2,656,224,000,000 2,599,667,000,000
Advances to lenders 4,381,000,000 3,165,000,000
Derivatives assets at fair value 7,333,000,000 10,430,000,000
Guaranty assets and buy-ups 0 0
Total financial assets 2,734,213,000,000 2,694,859,000,000
Financial liabilities [Abstract]    
Derivative liabilities at fair value 9,349,000,000 10,734,000,000
Guaranty obligations 0 0
Total financial liabilities 3,246,990,000,000 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 3,128,000,000 2,774,000,000
Available-for-sale securities 15,897,000,000 19,012,000,000
Mortgage loans held for sale 210,000,000 195,000,000
Mortgage loans held for investment, at fair value 389,199,000,000 392,355,000,000
Advances to lenders 483,000,000 523,000,000
Derivatives assets at fair value 125,000,000 65,000,000
Guaranty assets and buy-ups 676,000,000 706,000,000
Total financial assets 409,718,000,000 415,630,000,000
Financial liabilities [Abstract]    
Derivative liabilities at fair value 134,000,000 105,000,000
Guaranty obligations 1,811,000,000 2,433,000,000
Total financial liabilities 21,148,000,000 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 (6,202,000,000) (8,422,000,000)
Guaranty assets and buy-ups 0 0
Total financial assets (6,202,000,000) (8,422,000,000)
Financial liabilities [Abstract]    
Derivative liabilities at fair value (9,040,000,000) (9,370,000,000)
Guaranty obligations 0 0
Total financial liabilities (9,040,000,000) (9,370,000,000)
Estimated Fair Value [Member]
   
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 44,847,000,000 48,223,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements 29,450,000,000 38,975,000,000
Trading securities 30,844,000,000 30,768,000,000
Available-for-sale securities 32,099,000,000 38,171,000,000
Mortgage loans held for sale 374,000,000 380,000,000
Mortgage loans held for investment, at fair value 3,045,423,000,000 2,992,022,000,000
Advances to lenders 4,864,000,000 3,688,000,000
Derivatives assets at fair value 1,256,000,000 2,073,000,000
Guaranty assets and buy-ups 676,000,000 706,000,000
Total financial assets 3,189,833,000,000 3,155,006,000,000
Financial liabilities [Abstract]    
Derivative liabilities at fair value 443,000,000 1,469,000,000
Guaranty obligations 1,811,000,000 2,433,000,000
Total financial liabilities 3,259,098,000,000 3,241,494,000,000
Fannie Mae [Member]
   
Financial liabilities [Abstract]    
Long-term debt 5,204,000,000 1,308,000,000
Fannie Mae [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 244,399,000,000 259,638,000,000
Financial liabilities [Abstract]    
Short-term debt 97,399,000,000 72,295,000,000
Long-term debt 377,553,000,000 457,139,000,000
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 30,689,000,000 29,920,000,000
Financial liabilities [Abstract]    
Short-term debt 97,420,000,000 72,304,000,000
Long-term debt 387,920,000,000 463,991,000,000
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 218,495,000,000 215,960,000,000
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 942,000,000 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 249,184,000,000 245,880,000,000
Financial liabilities [Abstract]    
Short-term debt 97,420,000,000 72,304,000,000
Long-term debt 388,862,000,000 465,548,000,000
Consolidated Trusts [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 15,262,000,000 14,268,000,000
Financial liabilities [Abstract]    
Long-term debt 16,598,000,000 14,976,000,000
Consolidated Trusts [Member] | Carrying Value [Member]
   
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,765,436,000,000 2,766,222,000,000
Financial liabilities [Abstract]    
Short-term debt 1,804,000,000 2,154,000,000
Long-term debt 2,724,724,000,000 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 2,625,535,000,000 2,569,747,000,000
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,752,301,000,000 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 170,704,000,000 176,395,000,000
Financial liabilities [Abstract]    
Short-term debt 1,804,000,000 2,154,000,000
Long-term debt 16,457,000,000 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 2,796,239,000,000 2,746,142,000,000
Financial liabilities [Abstract]    
Short-term debt 1,804,000,000 2,154,000,000
Long-term debt 2,768,758,000,000 2,697,586,000,000
HARP loans [Member]
   
Financial liabilities [Abstract]    
Loans Receivable Refinanced under Home Affordable Refinance Program, Fair Value Disclosure 314,900,000,000 306,900,000,000
HARP loans [Member] | Fair Value Estimation Process [Member]
   
Financial Instruments [Line Items]    
Change In Estimated Fair Value Resulting From Change In Principal Market $ 2,900,000,000 $ 11,500,000,000