Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Trading securities	$ 444	$ 553	$ 779
Available-for-sale securities	1,156	1,622	2,357
Mortgage loans (includes $97,971, $101,835 and $101,448, respectively, related to consolidated trusts)	107,699	112,120	114,238
Other	143	110	175
Total interest income	109,442	114,405	117,549
Interest expense:
Short-term debt	146	94	131
Long-term debt (includes $80,326, $85,835 and $84,751, respectively, related to consolidated trusts)	87,887	94,343	95,014
Total interest expense	88,033	94,437	95,145
Net interest income	21,409	19,968	22,404
Benefit for credit losses	795	3,964	8,949
Net interest income after benefit for credit losses	22,204	23,932	31,353
Non-interest Income (loss)
Investment gains, net	1,336	936	1,127
Fair value gains (losses), net	(1,767)	(4,833)	2,959
Fee and other income	1,348	5,887	3,930
Non-interest income	917	1,990	8,016
Administrative expenses:
Salaries and employee benefits	1,319	1,321	1,218
Professional services	984	1,076	910
Occupancy expenses	182	203	189
Other administrative expenses	565	177	228
Total administrative expenses	3,050	2,777	2,545
Foreclosed property expense (income)	1,629	142	(2,839)
Temporary Payroll Cut Continuation Act of 2011 (TCCA) fees	1,621	1,375	1,001
Other expenses, net	613	478	95
Total expenses	6,913	4,772	802
Income before federal income taxes	16,208	21,150	38,567
Benefit (provision) for federal income taxes	(5,253)	(6,941)	45,415
Net income	10,955	14,209	83,982
Other comprehensive income (loss):
Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes	(763)	494	693
Other	437	36	126
Total other comprehensive income (loss)	(326)	530	819
Total comprehensive income	10,629	14,739	84,801
Less: Comprehensive income attributable to noncontrolling interest	(1)	(1)	(19)
Total comprehensive income attributable to Fannie Mae	10,628	14,738	84,782
Less: Net income attributable to noncontrolling interest	(1)	(1)	(19)
Net income attributable to Fannie Mae	10,954	14,208	83,963
Dividends distributed or available for distribution to senior preferred stockholder (Note 11)	(11,216)	(15,323)	(85,419)
Net loss attributable to common stockholders (Note 11)	$ (262)	$ (1,115)	$ (1,456)
Loss per share: Basic and Diluted (in dollars per share)	$ (0.05)	$ (0.19)	$ (0.25)
Weighted-average common shares outstanding: Basic and Diluted	5,762	5,762	5,762