Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Trading securities	$ 516	$ 444	$ 553
Available-for-sale securities	620	1,156	1,622
Mortgage loans (includes $95,266, $97,971 and $101,835, respectively, related to consolidated trusts)	104,642	107,699	112,120
Other	243	143	110
Total interest income	106,021	109,442	114,405
Interest expense:
Short-term debt	206	146	94
Long-term debt (includes $77,575, $80,326 and $85,835, respectively, related to consolidated trusts)	84,520	87,887	94,343
Total interest expense	84,726	88,033	94,437
Net interest income	21,295	21,409	19,968
Benefit for credit losses	2,155	795	3,964
Net interest income after benefit for credit losses	23,450	22,204	23,932
Non-interest Income (loss):
Investment gains, net	1,256	1,336	936
Fair value losses, net	(1,081)	(1,767)	(4,833)
Fee and other income	966	1,348	5,887
Non-interest income	1,141	917	1,990
Administrative expenses:
Salaries and employee benefits	1,336	1,319	1,321
Professional services	955	984	1,076
Occupancy expenses	186	182	203
Other administrative expenses	264	565	177
Total administrative expenses	2,741	3,050	2,777
Foreclosed property expense	644	1,629	142
Temporary Payroll Cut Continuation Act of 2011 (TCCA) fees	1,845	1,621	1,375
Other expenses, net	1,028	613	478
Total expenses	6,258	6,913	4,772
Income before federal income taxes	18,333	16,208	21,150
Provision for federal income taxes	(6,020)	(5,253)	(6,941)
Net income	12,313	10,955	14,209
Other comprehensive income (loss):
Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes	(642)	(763)	494
Other	(6)	437	36
Total other comprehensive income (loss)	(648)	(326)	530
Total comprehensive income	11,665	10,629	14,739
Less: Comprehensive income attributable to noncontrolling interest	0	(1)	(1)
Total comprehensive income attributable to Fannie Mae	11,665	10,628	14,738
Less: Net income attributable to noncontrolling interest	0	(1)	(1)
Net income attributable to Fannie Mae	12,313	10,954	14,208
Dividends distributed or available for distribution to senior preferred stockholder (Note 11)	(12,236)	(11,216)	(15,323)
Net income (loss) attributable to common stockholders (Note 11)	$ 77	$ (262)	$ (1,115)
Earnings (loss) per share: Basic	$ 0.01	$ (0.05)	$ (0.19)
Earnings (loss) per share: Diluted	$ 0.01	$ (0.05)	$ (0.19)
Weighted-average common shares outstanding: Basic	5,762	5,762	5,762
Weighted-average common shares outstanding: Diluted	5,893	5,762	5,762