Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Interest income:
Trading securities	$ 185		$ 234		$ 633		$ 756
Available-for-sale securities	546		789		1,870		2,551
Mortgage loans (includes $25,351 and $27,057, respectively, for the three months ended and $75,592 and $84,482, respectively, for the nine months ended related to consolidated trusts)	28,299		30,593		85,579		95,186
Other	37		53		143		131
Total interest income	29,067		31,669		88,225		98,624
Interest expense:
Short-term debt	29		38		109		112
Long-term debt (includes $20,905 and $23,395, respectively, for the three months ended and $62,785 and $73,469, respectively, for the nine months ended related to consolidated trusts)	23,456		26,314		70,563		82,570
Total interest expense	23,485		26,352		70,672		82,682
Net interest income	5,582		5,317		17,553		15,942
Benefit (provision) for credit losses	2,609		(2,079)		8,949		(1,038)
Net interest income (loss) after benefit (provision) for credit losses	8,191		3,238		26,502		14,904
Investment gains, net	648		134		1,056		381
Net other-than-temporary impairments	(27)	[1]	(38)		(42)	[1]	(701)
Fair value gains (losses), net	335		(1,020)		1,998		(3,186)
Debt extinguishment (losses) gains, net	92		(54)		96		(181)
Fee and other income (expense)	741		378		1,794		1,148
Non-interest income (loss)	1,789		(600)		4,902		(2,539)
Administrative expenses:
Salaries and employee benefits	307		294		928		892
Professional services	236		195		678		542
Occupancy expenses	48		48		141		139
Other administrative expenses	55		51		166		146
Total administrative expenses	646		588		1,913		1,719
Foreclosed property (income) expense	(1,165)		(48)		(1,757)		221
Other expenses	400		285		955		775
Total other (income) expenses	(119)		825		1,111		2,715
Income (loss) before federal income taxes	10,099		1,813		30,293		9,650
Benefit (Provision) for federal income taxes	(1,355)		0		47,231	[2]	0
Net income (loss)	8,744		1,813		77,524		9,650
Other comprehensive income (loss):
Changes in unrealized gains (losses) on available-for-sale securities, net of reclassification adjustments and taxes	(133)		741		532		1,416
Other	(1)	[3]	5	[3]	154	[3]	20	[3]
Total other comprehensive income (loss)	(134)		746		686		1,436
Total comprehensive income (loss)	8,610		2,559		78,210		11,086
Less: Comprehensive (income) loss attributable to the noncontrolling interest	(7)		8		(18)		4
Total comprehensive income (loss) attributable to Fannie Mae	8,603		2,567		78,192		11,090
Net income (loss)	8,744		1,813		77,524		9,650
Less: Net (income) loss attributable to noncontrolling interest	(7)		8		(18)		4
Net (loss) income attributable to Fannie Mae	8,737		1,821		77,506		9,654
Dividends distributed or available for distribution to senior preferred stockholder	(8,617)	[4]	(2,929)	[4]	(78,228)	[4]	(8,675)	[4]
Net income (loss) attributable to common stockholders (Note 11)	$ 120		$ (1,108)		$ (722)		$ 979
Earnings (Loss) Per Share:
Earnings (loss) per share, Basic	$ 0.02		$ (0.19)		$ (0.13)		$ 0.17
Earnings (loss) per share, Diluted	$ 0.02		$ (0.19)		$ (0.13)		$ 0.17
Weighted-average common shares outstanding:
Weighted-average common shares outstanding, Basic	5,762	[5]	5,762	[5]	5,762	[5]	5,762	[5]
Weighted-average common shares outstanding, Diluted	5,893	[5]	5,762	[5]	5,762	[5]	5,893	[5]

[1] Includes $26 million of other-than-temporary impairments recognized in earnings for the three and nine months ended September 30, 2013, as we had the 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 primarily are directly attributable to each segment based on the nature of the item.

[3] Primarily represents activity from our defined benefit pension plans.

[4] Represents our required dividend payments to Treasury under the terms of the senior preferred stock purchase agreement. For the three months ended September 30, 2013, the dividend is calculated based on our net worth as of September 30, 2013 less the applicable capital reserve amount of $3.0 billion and for the nine months ended September 30, 2013, we add dividends paid related to 2013 to this amount. For the three and nine months ended September 30, 2012, an annual dividend rate of 10% on the aggregate liquidation preference was used to calculate the dividend.

[5] Includes 4.6 billion 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 September 30, 2013.