Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 20,847	$ 19,228
Restricted cash (includes $25,401 and $23,982, respectively, related to consolidated trusts)	29,587	28,995
Federal funds sold and securities purchased under agreements to resell or similar arrangements	16,700	38,975
Investments in securities:
Trading, at fair value	26,630	30,768
Available-for-sale, at fair value (includes $561 and $998, respectively, related to consolidated trusts)	34,026	38,171
Total investments in securities	60,656	68,939
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $25 and $31, respectively, related to consolidated trusts)	625	380
Total loans held for investment	3,043,228	3,069,706
Allowance for loan losses	(39,067)	(43,846)
Total loans held for investment, net of allowance	3,004,161	3,025,860
Total mortgage loans	3,004,786	3,026,240
Accrued interest receivable, net (includes $7,470 and $7,271, respectively, related to consolidated trusts)	8,472	8,319
Acquired property, net	11,560	11,621
Deferred tax assets, net	44,809	47,560
Other assets (includes cash pledged as collateral of $1,821 and $1,590, respectively)	21,400	20,231
Total assets	3,218,817	3,270,108
Liabilities:
Accrued interest payable (includes $8,213 and $8,276, respectively, related to consolidated trusts)	10,203	10,553
Other liabilities (includes $453 and $488, respectively, related to consolidated trusts)	12,957	15,441
Total liabilities	3,212,705	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	(125,123)	(121,227)
Accumulated other comprehensive income	1,620	1,203
Treasury stock, at cost, 150,682,046 shares	(7,401)	(7,401)
Total Fannie Mae stockholders’ equity	6,062	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)	6,112	9,591
Total liabilities and equity	3,218,817	3,270,108
Fannie Mae [Member]
Mortgage loans:
Total loans held for investment	284,609	300,159
Allowance for loan losses	(36,643)	(40,521)
Total mortgage loans	248,566	259,987
Liabilities:
Debt (includes $3,432 and $1,308, respectively, of debt of Fannie Mae and $16,420 and $14,976, respectively, of debt of consolidated trusts, at fair value)	477,535	529,434
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $25,401 and $23,982, respectively, related to consolidated trusts)	25,401	23,982
Investments in securities:
Available-for-sale, at fair value (includes $561 and $998, respectively, related to consolidated trusts)	561	998
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $25 and $31, respectively, related to consolidated trusts)	25	31
Total loans held for investment	2,758,619	2,769,547
Allowance for loan losses	(2,424)	(3,325)
Total mortgage loans	2,756,220	2,766,253
Accrued interest receivable, net (includes $7,470 and $7,271, respectively, related to consolidated trusts)	7,470	7,271
Liabilities:
Accrued interest payable (includes $8,213 and $8,276, respectively, related to consolidated trusts)	8,213	8,276
Debt (includes $3,432 and $1,308, respectively, of debt of Fannie Mae and $16,420 and $14,976, respectively, of debt of consolidated trusts, at fair value)	2,712,010	2,705,089
Other liabilities (includes $453 and $488, respectively, related to consolidated trusts)	$ 453	$ 488