Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income:
Trading securities	$ 140	$ 99	$ 388	$ 330
Available-for-sale securities	134	261	507	931
Mortgage loans (includes $23,254 and $24,537, respectively, for the three months ended and $71,746 and $73,426, respectively, for the nine months ended related to consolidated trusts)	25,611	26,980	78,828	80,706
Other	66	37	160	104
Total interest income	25,951	27,377	79,883	82,071
Interest expense:
Short-term debt	56	37	164	99
Long-term debt (includes $18,814 and $19,891, respectively, for the three months ended and $58,993 and $59,934, respectively, for the nine months ended related to consolidated trusts)	20,460	21,752	64,229	65,640
Total interest expense	20,516	21,789	64,393	65,739
Net interest income	5,435	5,588	15,490	16,332
Benefit for credit losses	673	1,550	3,458	1,050
Net interest income after benefit for credit losses	6,108	7,138	18,948	17,382
Non-interest income (loss):
Investment gains, net	467	299	934	1,155
Fair value losses, net	(491)	(2,589)	(4,971)	(1,902)
Fee and other income	175	259	552	1,123
Non-interest income (loss)	151	(2,031)	(3,485)	376
Administrative expenses:
Salaries and employee benefits	322	317	1,017	999
Professional services	237	219	684	741
Occupancy expenses	45	43	136	129
Other administrative expenses	57	373	190	495
Total administrative expenses	661	952	2,027	2,364
Foreclosed property expense	110	497	507	1,152
Temporary Payroll Tax Cut Continuation Act of 2011 (“TCCA”) fees	465	413	1,358	1,192
Other expenses, net	300	215	818	412
Total expenses	1,536	2,077	4,710	5,120
Income before federal income taxes	4,723	3,030	10,753	12,638
Provision for federal income taxes	(1,527)	(1,070)	(3,475)	(4,150)
Net income	3,196	1,960	7,278	8,488
Other comprehensive income (loss):
Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes	(205)	(177)	(478)	(548)
Other	(2)	430	(6)	428
Total other comprehensive income (loss)	(207)	253	(484)	(120)
Total comprehensive income attributable to Fannie Mae	2,989	2,213	6,794	8,368
Net income attributable to Fannie Mae	3,196	1,960	7,278	8,488
Dividends distributed or available for distribution to senior preferred stockholder (Note 10)	(2,977)	(2,202)	(6,765)	(8,357)
Net income (loss) attributable to common stockholders (Note 10)	$ 219	$ (242)	$ 513	$ 131
Earnings (loss) per share, basic (in dollars per share)	$ 0.04	$ (0.04)	$ 0.09	$ 0.02
Earnings (loss) per share, diluted (in dollars per share)	$ 0.04	$ (0.04)	$ 0.09	$ 0.02
Weighted-average common shares outstanding, basic	5,762	5,762	5,762	5,762
Weighted-average common shares outstanding, diluted	5,893	5,762	5,893	5,893