Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 14,056		$ 19,228
Restricted cash (includes $20,550 and $23,982, respectively, related to consolidated trusts)	24,583		28,995
Federal funds sold and securities purchased under agreements to resell or similar arrangements	12,750		38,975
Investments in securities:
Trading, at fair value	31,795		30,768
Available-for-sale, at fair value (includes $949 and $998, respectively, related to consolidated trusts)	37,128		38,171
Total investments in securities	68,923		68,939
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $201 and $31, respectively, related to consolidated trusts)	1,494		380
Loans held for investment, at amortized cost (includes $14,637 and $14,268, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $415 and $442, respectively, related to consolidated trusts)	3,058,433		3,069,706
Allowance for loan losses	(41,911)		(43,846)
Total loans held for investment, net of allowance	3,016,522		3,025,860
Total mortgage loans	3,018,016		3,026,240
Accrued interest receivable, net (includes $7,463 and $7,271, respectively, related to consolidated trusts)	8,459		8,319
Acquired property, net	11,960		11,621
Deferred tax assets, net	45,366		47,560
Other assets (includes cash pledged as collateral of $1,291 and $1,590, respectively)	22,392		20,231
Total assets	3,226,505		3,270,108
Liabilities:
Accrued interest payable (includes $8,262 and $8,276, respectively, related to consolidated trusts)	10,681		10,553
Federal funds purchased and securities sold under agreements to repurchase	25	[1]	0	[1]
Other liabilities (includes $444 and $488, respectively, related to consolidated trusts)	13,012		15,441
Total liabilities	3,218,413		3,260,517
Commitments and contingencies (Note 17)	0		0
Fannie Mae stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued and outstanding	117,149		117,149
Preferred stock, 700,000,000 shares are authorized—555,374,922 shares issued and outstanding	19,130		19,130
Common stock, no par value, no maximum authorization—1,308,762,703 shares issued and 1,158,080,657 shares outstanding	687		687
Accumulated deficit	(123,098)		(121,227)
Accumulated other comprehensive income	1,575		1,203
Treasury stock, at cost, 150,682,046 shares	(7,401)		(7,401)
Total Fannie Mae stockholders’ equity	8,042		9,541
Noncontrolling interest	50		50
Total equity (See Note 1: Impact of U.S. Government Support for information on our dividend obligation to Treasury)	8,092		9,591
Total liabilities and equity	3,226,505		3,270,108
Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost (includes $14,637 and $14,268, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $415 and $442, respectively, related to consolidated trusts)	290,903		300,159
Allowance for loan losses	(39,004)		(40,521)
Total mortgage loans	253,192		259,987
Liabilities:
Debt (includes $1,775 and $1,308, respectively, of debt of Fannie Mae and $15,373 and $14,976, respectively, of debt of consolidated trusts, at fair value)	481,853		529,434
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $20,550 and $23,982, respectively, related to consolidated trusts)	20,550		23,982
Investments in securities:
Available-for-sale, at fair value (includes $949 and $998, respectively, related to consolidated trusts)	949		998
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $201 and $31, respectively, related to consolidated trusts)	201		31
Loans held for investment, at amortized cost (includes $14,637 and $14,268, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $415 and $442, respectively, related to consolidated trusts)	2,767,530		2,769,547
Allowance for loan losses	(2,907)		(3,325)
Total mortgage loans	2,764,824		2,766,253
Accrued interest receivable, net (includes $7,463 and $7,271, respectively, related to consolidated trusts)	7,463		7,271
Liabilities:
Accrued interest payable (includes $8,262 and $8,276, respectively, related to consolidated trusts)	8,262		8,276
Debt (includes $1,775 and $1,308, respectively, of debt of Fannie Mae and $15,373 and $14,976, respectively, of debt of consolidated trusts, at fair value)	2,712,842		2,705,089
Other liabilities (includes $444 and $488, respectively, related to consolidated trusts)	$ 444		$ 488

[1] Securities sold under agreements to repurchase represent agreements to repurchase for a specified price, with repayment generally occurring on the following day.