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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
 
(Dollars in millions)
Current income tax benefit (provision)
 
$
600

 
 
 
$
(2,014
)
 
 
 
$
271

 
Deferred income tax provision(1)
 
(16,584
)
 
 
 
(4,006
)
 
 
 
(5,524
)
 
Provision for federal income taxes
 
$
(15,984
)
 
 
 
$
(6,020
)
 
 
 
$
(5,253
)
 
__________
(1) 
Amount excludes the current income tax effect of items recognized directly in “Fannie Mae stockholders’ equity (deficit).”
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table displays the difference between the statutory corporate tax rate and our effective tax rate.
 
For the Year Ended December 31,
 
2017
 
2016
 
2015
Statutory corporate tax rate
 
35.0

%
 
 
35.0

%
 
 
35.0

%
Equity investments in affordable housing projects
 
(1.4
)
 
 
 
(1.9
)
 
 
 
(2.6
)
 
Effect of corporate tax rate change
 
53.6

 
 
 

 
 
 

 
Other
 
(0.6
)
 
 
 
(0.3
)
 
 
 
0.9

 
Valuation allowance
 

 
 
 

 
 
 
(0.9
)
 
Effective tax rate
 
86.6

%
 
 
32.8

%
 
 
32.4

%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The following table displays our deferred tax assets and deferred tax liabilities. The deferred tax assets and liabilities as of December 31, 2016 were measured at the applicable statutory corporate tax rate of 35% for the period. The deferred tax assets and liabilities as of December 31, 2017 have been remeasured using the 21% statutory corporate tax rate enacted in the fourth quarter of 2017 with an effective date of January 1, 2018.
 
As of December 31,
 
2017
 
2016
 
(Dollars in millions)
Deferred tax assets:
 
 
 
 
 
 
 
Mortgage and mortgage-related assets
 
$
10,397

 
 
 
$
17,130

 
Allowance for loan losses and basis in acquired property, net
 
2,286

 
 
 
9,496

 
Debt and derivative instruments
 
1,205

 
 
 
2,989

 
Partnership credits
 
1,695

 
 
 
1,968

 
Partnership and other equity investments
 
311

 
 
 
667

 
Other, net
 
1,621

 
 
 
1,665

 
Total deferred tax assets
 
17,515

 
 
 
33,915

 
Deferred tax liabilities:
 
 
 
 
 
 
 
Unrealized gains on AFS securities, net
 
165

 
 
 
385

 
Total deferred tax liabilities
 
165

 
 
 
385

 
Deferred tax assets, net
 
$
17,350

 
 
 
$
33,530

 
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,
 
2017
 
2016
 
2015
 
(Dollars in millions)
Unrecognized tax benefits as of January 1
 
$

 
 
 
$

 
 
 
$
213

 
Gross increases—tax positions in current year
 
514

 
 
 

 
 
 

 
Gross decreases—tax positions in prior years
 

 
 
 

 
 
 
(213
)
 
Unrecognized tax benefits as of December 31(1)
 
$
514

 
 
 
$

 
 
 
$

 
__________
(1) 
Amount excludes tax credits of $220 million as of December 31, 2017.
We had $514 million of unrecognized tax benefits as of December 31, 2017. If these positions were to resolve favorably, our effective tax would be reduced in future periods by $205 million. We had no unrecognized tax benefits as of December 31, 2016 or December 31, 2015.