Consolidated Balance Sheets (USD $)	Dec. 31, 2013		Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 19,228,000,000		$ 21,117,000,000
Restricted cash (includes $23,982 and $61,976, respectively, related to consolidated trusts)	28,995,000,000		67,919,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements	38,975,000,000		32,500,000,000
Investments in securities:
Trading, at fair value	30,768,000,000		40,695,000,000
Available-for-sale, at fair value (includes $998 and $935, respectively, related to consolidated trusts)	38,171,000,000		63,181,000,000
Total investments in securities	68,939,000,000		103,876,000,000
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $31 and $72, respectively, related to consolidated trusts)	380,000,000		464,000,000
Loans held for investment, at amortized cost (includes $14,268 and 10,800, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $442 and $943, respectively, related to consolidated trusts)	3,069,706,000,000		3,007,737,000,000
Allowance for loan losses	(43,846,000,000)		(58,795,000,000)
Total loans held for investment, net of allowance	3,025,860,000,000		2,948,942,000,000
Total mortgage loans	3,026,240,000,000		2,949,406,000,000
Accrued interest receivable, net (includes $7,271 and $7,567, respectively, related to consolidated trusts)	8,319,000,000		9,176,000,000
Acquired property, net	11,621,000,000	[1]	10,489,000,000	[1]
Deferred Tax Assets	47,560,000,000		0
Other assets (includes cash pledged as collateral of $1,590 and $1,222, respectively)	20,231,000,000		27,939,000,000
Total assets	3,270,108,000,000		3,222,422,000,000
Liabilities:
Accrued interest payable (includes $8,276 and $8,645, respectively, related to consolidated trusts)	10,553,000,000		11,303,000,000
Other liabilities (includes $488 and $1,059, respectively, related to consolidated trusts)	15,441,000,000		14,378,000,000
Total liabilities	3,260,517,000,000		3,215,198,000,000
Commitments and contingencies (Note 19)
Fannie Mae stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued and outstanding	117,149,000,000		117,149,000,000
Preferred stock, 700,000,000 shares are authorized—555,374,922 shares issued and outstanding	19,130,000,000		19,130,000,000
Common stock, no par value, no maximum authorization—1,308,762,703 shares issued, 1,158,080,657 and 1,158,077,970 shares outstanding, respectively	687,000,000		687,000,000
Accumulated deficit	(121,227,000,000)		(122,766,000,000)
Accumulated other comprehensive income	1,203,000,000		384,000,000
Treasury stock, at cost, 150,682,046 and 150,684,733 shares, respectively	(7,401,000,000)		(7,401,000,000)
Total Fannie Mae stockholders’ equity	9,541,000,000		7,183,000,000
Noncontrolling interest	50,000,000		41,000,000
Total equity (See Note 1: Impact of U.S. Government Support and (Loss) Earnings per Share for information on our dividend obligation to Treasury)	9,591,000,000		7,224,000,000
Total liabilities and equity	3,270,108,000,000		3,222,422,000,000
Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost (includes $14,268 and 10,800, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $442 and $943, respectively, related to consolidated trusts)	300,159,000,000		355,544,000,000
Allowance for loan losses	(40,521,000,000)		(50,519,000,000)
Total mortgage loans	259,987,000,000		305,417,000,000
Liabilities:
Debt (includes $1,308 and $793, respectively, of debt of Fannie Mae and $14,976 and $11,647, respectively, of debt of consolidated trusts, at fair value)	529,434,000,000		615,864,000,000
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $23,982 and $61,976, respectively, related to consolidated trusts)	23,982,000,000		61,976,000,000
Investments in securities:
Available-for-sale, at fair value (includes $998 and $935, respectively, related to consolidated trusts)	998,000,000		935,000,000
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $31 and $72, respectively, related to consolidated trusts)	31,000,000		72,000,000
Loans held for investment, at amortized cost (includes $14,268 and 10,800, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $442 and $943, respectively, related to consolidated trusts)	2,769,547,000,000		2,652,193,000,000
Allowance for loan losses	(3,325,000,000)		(8,276,000,000)
Total mortgage loans	2,766,253,000,000		2,643,989,000,000
Accrued interest receivable, net (includes $7,271 and $7,567, respectively, related to consolidated trusts)	7,271,000,000		7,567,000,000
Liabilities:
Accrued interest payable (includes $8,276 and $8,645, respectively, related to consolidated trusts)	8,276,000,000		8,645,000,000
Debt (includes $1,308 and $793, respectively, of debt of Fannie Mae and $14,976 and $11,647, respectively, of debt of consolidated trusts, at fair value)	2,705,089,000,000		2,573,653,000,000
Other liabilities (includes $488 and $1,059, respectively, related to consolidated trusts)	$ 488,000,000		$ 1,059,000,000

[1] Includes valuation allowance of $686 million, $669 million and $1.0 billion for the years ended December 31, 2013, 2012 and 2011, respectively.