Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
TCCA fees	$ 1,001		$ 238		$ 0
Interest income:
Trading securities	779		989		1,087
Available-for-sale securities	2,357		3,299		3,277
Mortgage loans (includes $110,448, $110,451, and $123,633, respectively, related to consolidated trusts)	114,238		124,706		138,462
Other	175		196		117
Total interest income	117,549		129,190		142,943
Interest expense:
Short-term debt	131		152		310
Long-term debt (includes $84,751, $95,612, and $108,641, respectively, related to consolidated trusts)	95,014		107,537		123,352
Total interest expense	95,145		107,689		123,662
Net interest income	22,404		21,501		19,281
Benefit (provision) for credit losses	8,949		852		(26,718)
Net interest income (loss) after benefit (provision) for credit losses	31,353		22,353		(7,437)
Investment gains, net	1,191		487		506
Net other-than-temporary impairments	(64)	[1]	(713)		(308)
Fair value gains (losses), net	2,959		(2,977)		(6,621)
Debt extinguishment gains (losses), net	131		(244)		(232)
Fee and other income	3,930		1,487		1,163
Non-interest income (loss)	8,147		(1,960)		(5,492)
Administrative expenses:
Salaries and employee benefits	1,218		1,195		1,236
Professional services	910		766		736
Occupancy expenses	189		188		179
Other administrative expenses	228		218		219
Total administrative expenses	2,545		2,367		2,370
Foreclosed property (income) expense	(2,839)		(254)		780
Other expenses, net	226		822		866
Total expenses	933		3,173		4,016
Income (loss) before federal income taxes	38,567		17,220		(16,945)
Benefit for federal income taxes	45,415	[2]	0		90
Net income (loss)	83,982		17,220		(16,855)
Other comprehensive income (loss):
Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes	693		1,735		622
Other	126		(116)		(175)
Net other comprehensive income	819		1,619		447
Total comprehensive income (loss)	84,801		18,839		(16,408)
Less: Comprehensive (income) loss attributable to noncontrolling interest	(19)		4		0
Total comprehensive income (loss) attributable to Fannie Mae	84,782		18,843		(16,408)
Less: Net (income) loss attributable to noncontrolling interest	(19)		4		0
Net income (loss) attributable to Fannie Mae	83,963		17,224		(16,855)
Dividends distributed or available for distribution to senior preferred stockholder	(85,419)	[3]	(15,827)	[3]	(9,614)	[3]
Net (loss) income attributable to common stockholders (Note 11)	(1,456)		1,397		(26,469)
(Loss) earnings per share:
Basic (per share)	$ (0.25)		$ 0.24		$ (4.61)
Diluted (per share)	$ (0.25)		$ 0.24		$ (4.61)
Weighted-average common shares outstanding:
Basic	5,762	[4]	5,762	[4]	5,737	[4]
Diluted	5,762	[4]	5,893	[4]	5,737	[4]
US Treasury [Member]
TCCA fees	$ 1,001	[5]	$ 238	[5],[6]

[1] Includes $34 million of other-than-temporary impairments recognized in earnings for the year ended December 31, 2013, related to our intent to sell the related securities before recovery of their amortized cost basis.

[2] Primarily represents the release of the valuation allowance for our deferred tax assets that generally are directly attributable to each segment based on the nature of the item.

[3] Dividends available for distribution as of December 31, 2013 (relating to the dividend period for the three months ended March 31, 2014) are calculated based on our net worth as of December 31, 2013 less the applicable capital reserve amount of $2.4 billion. For quarterly dividend periods in 2013, dividends distributed were calculated based on our net worth as of the end of the immediately preceding fiscal quarter less the applicable capital reserve amount of $3.0 billion. During the years ended December 31, 2012 and 2011, an annual dividend rate of 10% on the aggregate liquidation preference was used to calculate the dividend.

[4] Includes 4.6 billion, 4.7 billion and 4.6 billion for the years ended December 31, 2013, 2012 and 2011, respectively, of weighted-average shares of common stock, that would be issued upon the full exercise of the warrant issued to Treasury from the date the warrant was issued through December 31, 2013, 2012 and 2011, respectively.

[5] Pursuant to the TCCA, effective April 1, 2012, we increased the guaranty fee on all single-family residential mortgages delivered to us on or after that date by 10 basis points, and the incremental revenue must be remitted to Treasury. The resulting revenue is included in guaranty fee income and the expense is recognized as “TCCA fees.” This increase in guaranty fee is also included in the single-family average charged guaranty fee.

[6] Certain prior period amounts have been reclassified to conform with the current period presentation.