Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The following table displays the components of our provision for federal income taxes.

	For the Year Ended December 31,
	2016			2015				2014
	(Dollars in millions)
Current income tax provision (benefit)		$	2,014		$	(271	)		$	1,879
Deferred income tax provision(1)		4,006			5,524				5,062
Provision for federal income taxes		$	6,020		$	5,253			$	6,941

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⁽¹⁾  Amount excludes the income tax effect of items recognized directly in “Fannie Mae stockholders’ equity.”

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following table displays the difference between our effective tax rate and the statutory federal tax rate.

	For the Year Ended December 31,
	2016				2015				2014
Statutory corporate tax rate		35.0		%		35.0		%		35.0		%
Equity investments in affordable housing projects		(1.9	)			(2.6	)			(1.8	)
Other		(0.3	)			0.9				1.4
Valuation allowance		—				(0.9	)			(1.8	)
Effective tax rate		32.8		%		32.4		%		32.8		%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The following table displays our deferred tax assets and deferred tax liabilities.

	As of December 31,
	2016			2015
	(Dollars in millions)
Deferred tax assets:
Mortgage and mortgage-related assets		$	17,130		$	16,956
Allowance for loan losses and basis in acquired property, net		9,496			11,760
Debt and derivative instruments		2,989			3,512
Partnership credits		1,968			3,402
Partnership and other equity investments		667			745
Other, net		1,665			1,543
Total deferred tax assets		33,915			37,918
Deferred tax liabilities:
Unrealized gains on AFS securities, net		385			731
Total deferred tax liabilities		385			731
Deferred tax assets, net		$	33,530		$	37,187

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

The following table displays the changes in our unrecognized tax benefits.

	For the Year Ended December 31,
	2016			2015				2014
	(Dollars in millions)
Unrecognized tax benefits as of January 1		$	—		$	213			$	514
Gross decreases—tax positions in prior years		—			(213		)		(301		)
Unrecognized tax benefits as of December 31(1)		$	—		$	—			$	213

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⁽¹⁾  Amounts exclude tax credits of $91 million as of December 31, 2014.