Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Trading securities	$ 1,336	$ 706	$ 516
Available-for-sale securities	230	335	620
Mortgage loans (includes $107,964, $100,593 and $95,266, respectively, related to consolidated trusts)	114,605	108,319	104,642
Interest Income, Federal Funds Sold and Securities Purchased under Agreements to Resell	742	373	141
Other	136	123	102
Total interest income	117,049	109,856	106,021
Interest expense:
Short-term debt	(468)	(250)	(206)
Long-term debt (includes $89,682, $82,580 and $77,575, respectively, related to consolidated trusts)	(95,630)	(88,873)	(84,520)
Total interest expense	(96,098)	(89,123)	(84,726)
Net interest income	20,951	20,733	21,295
Benefit for credit losses	3,309	2,041	2,155
Net interest income after benefit for credit losses	24,260	22,774	23,450
Non-interest Income:
Investment gains, net	952	1,522	1,256
Fair value losses, net	1,121	(1,211)	(1,081)
Fee and other income	979	2,227	966
Non-interest income	3,052	2,538	1,141
Administrative expenses:
Salaries and employee benefits	(1,451)	(1,328)	(1,336)
Professional services	(1,032)	(933)	(955)
Other administrative expenses	(576)	(476)	(450)
Total administrative expenses	(3,059)	(2,737)	(2,741)
Foreclosed property expense	(617)	(521)	(644)
Temporary Payroll Cut Continuation Act of 2011 (“TCCA”) fees	(2,284)	(2,096)	(1,845)
Other expenses, net	(1,253)	(1,511)	(1,028)
Total expenses	(7,213)	(6,865)	(6,258)
Income before federal income taxes	20,099	18,447	18,333
Provision for federal income taxes	(4,140)	(15,984)	(6,020)
Total comprehensive income
Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes	(344)	(206)	(642)
Other, net of tax	(4)	0	(6)
Total other comprehensive loss	(348)	(206)	(648)
Total comprehensive income attributable to Fannie Mae	15,611	2,257	11,665
Net income attributable to Fannie Mae	15,959	2,463	12,313
Dividends distributed or available for distribution to senior preferred stockholder	(12,613)	(8,944)	(12,236)
Net income (loss) attributable to common stockholders	$ 3,346	$ (6,481)	$ 77
Earnings (loss) per share: Basic	$ 0.58	$ (1.12)	$ 0.01
Earnings (loss) per share: Diluted	$ 0.57	$ (1.12)	$ 0.01
Weighted Average Number of Shares Outstanding, Basic	5,762	5,762	5,762
Weighted-average common shares outstanding: Diluted	5,893	5,762	5,893