Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 16,329	$ 19,228
Restricted cash (includes $24,106 and $23,982, respectively, related to consolidated trusts)	28,518	28,995
Federal funds sold and securities purchased under agreements to resell or similar arrangements	29,450	38,975
Investments in securities:
Trading, at fair value	30,844	30,768
Available-for-sale, at fair value (includes $699 and $998, respectively, related to consolidated trusts)	32,099	38,171
Total investments in securities	62,943	68,939
Mortgage loans:
Loans held for sale, at lower of cost or fair value	368	380
Total loans held for investment	3,046,766	3,069,706
Allowance for loan losses	(36,931)	(43,846)
Total loans held for investment, net of allowance	3,009,835	3,025,860
Total mortgage loans	3,010,203	3,026,240
Accrued interest receivable, net (includes $7,506 and $7,271, respectively, related to consolidated trusts)	8,566	8,319
Acquired property, net	11,339	11,621
Deferred tax assets, net	42,757	47,560
Other assets (includes cash pledged as collateral of $1,677 and $1,590, respectively)	20,211	20,231
Total assets	3,230,316	3,270,108
Liabilities:
Accrued interest payable (includes $8,215 and $8,276, respectively, related to consolidated trusts)	10,492	10,553
Other liabilities (includes $466 and $488, respectively, related to consolidated trusts)	11,945	15,441
Total liabilities	3,223,917	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 1,158,082,750 and 1,158,080,657 shares outstanding, respectively	687	687
Accumulated deficit	(124,931)	(121,227)
Accumulated other comprehensive income	1,715	1,203
Treasury stock, at cost, 150,679,953 and 150,682,046 shares, respectively	(7,401)	(7,401)
Total Fannie Mae stockholders’ equity	6,349	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)	6,399	9,591
Total liabilities and equity	3,230,316	3,270,108
Fannie Mae [Member]
Mortgage loans:
Total loans held for investment	278,961	300,159
Allowance for loan losses	(34,562)	(40,521)
Total mortgage loans	244,743	259,987
Liabilities:
Debt (includes $5,204 and $1,308, respectively, of debt of Fannie Mae and $16,598 and $14,976, respectively, of debt of consolidated trusts, at fair value)	474,952	529,434
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $24,106 and $23,982, respectively, related to consolidated trusts)	24,106	23,982
Investments in securities:
Available-for-sale, at fair value (includes $699 and $998, respectively, related to consolidated trusts)	699	998
Mortgage loans:
Total loans held for investment	2,767,805	2,769,547
Allowance for loan losses	(2,369)	(3,325)
Total mortgage loans	2,765,460	2,766,253
Accrued interest receivable, net (includes $7,506 and $7,271, respectively, related to consolidated trusts)	7,506	7,271
Liabilities:
Accrued interest payable (includes $8,215 and $8,276, respectively, related to consolidated trusts)	8,215	8,276
Debt (includes $5,204 and $1,308, respectively, of debt of Fannie Mae and $16,598 and $14,976, respectively, of debt of consolidated trusts, at fair value)	2,726,528	2,705,089
Other liabilities (includes $466 and $488, respectively, related to consolidated trusts)	$ 466	$ 488