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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Taxes [Line Items]  
Provision for (Benefit From) Income Taxes
The provision for (benefit from) income taxes consists of the following:
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Current
 
 
 
 
 
 
Federal
$
(7
)
 
$

 
$
(1
)
 
State
36

 
5

 
3

 
Foreign
59

 
37

 
63

 
Current income tax provision
88

 
42

 
65

 
 
 
 
 
 
 
Deferred
 
 
 
 
 
 
Federal
63

 
(205
)
 
51

 
State
(39
)
 
(5
)
 
5

 
Foreign
(10
)
 
18

 
(5
)
 
Deferred income tax provision
14

 
(192
)
 
51

Provision for (benefit from) income taxes
$
102

 
$
(150
)
 
$
116

Pretax Income (Loss) for Domestic and Foreign Operations
Pretax income for domestic and foreign operations consists of the following:
 
Year Ended December 31,
 
2018
 
2017
 
2016
United States
$
114

 
$
17

 
$
127

Foreign
153

 
194

 
152

Pretax income
$
267

 
$
211

 
$
279

Deferred Income Tax Assets and Liabilities
Deferred income tax assets and liabilities are comprised of the following:
 
 
As of December 31,
 
 
2018
 
2017
Deferred income tax assets:
 
 
 
 
Net tax loss carryforwards
$
1,390

 
$
1,104

 
Accrued liabilities and deferred revenue
230

 
216

 
Tax credits
17

 
24

 
Depreciation and amortization
16

 
4

 
Provision for doubtful accounts
6

 
8

 
Other
38

 
50

 
Valuation allowance (a)
(311
)
 
(331
)
Deferred income tax assets
1,386

 
1,075

 
 
 
 
 
Deferred income tax liabilities:
 
 
 
 
Depreciation and amortization
60

 
121

 
Prepaid expenses
20

 
20

 
Other
5

 
3

Deferred income tax liabilities
85

 
144

Deferred income tax assets, net
$
1,301

 
$
931

__________
(a) 
The valuation allowance of $311 million at December 31, 2018 relates to tax loss carryforwards and certain deferred tax assets of $283 million and $28 million, respectively. The valuation allowance will be reduced when and if the Company determines it is more likely than not that the related deferred income tax assets will be realized. The valuation allowance of $331 million at December 31, 2017 relates to tax loss carryforwards and certain deferred tax assets of $302 million and $29 million, respectively. The valuation allowance will be reduced when and if the Company determines it is more likely than not that the related deferred income tax assets will be re
Reconciliation of U.S Federal Income Tax Statutory Rate and Effective Income Tax Rate
The reconciliation between the U.S. federal income tax statutory rate and the Company’s effective income tax rate is as follows:
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
U.S. federal statutory rate
21.0
 %
 
35.0
 %
 
35.0
 %
Adjustments to reconcile to the effective rate:
 
 
 
 
 
 
State and local income taxes, net of federal tax benefits
5.5

 
3.8

 
2.0

 
Changes in valuation allowances
6.3

 
(4.7
)
 
(0.2
)
 
Taxes on foreign operations at rates different than statutory U.S. federal rates
(5.2
)
 
(3.6
)
 
3.1

 
Stock-based compensation
(0.8
)
 
(3.4
)
 

 
Tax Act (benefit) expense
11.2

 
(100.8
)
 

 
Other non-deductible expenses
1.1

 
2.2

 
1.7

 
Other
(0.9
)
 
0.4

 

 
 
38.2
 %
 
(71.1
)%
 
41.6
 %


Changes in Gross Unrecognized Tax Benefits
The following is a tabular reconciliation of the gross amount of unrecognized tax benefits for the year:
 
 
2018
 
2017
 
2016
Balance at January 1
$
63

 
$
59

 
$
56

 
Additions for tax positions related to current year
8

 
6

 
3

 
Additions for tax positions for prior years

 
9

 
3

 
Reductions for tax positions for prior years
(6
)
 
(10
)
 
(3
)
 
Settlements
(3
)
 

 

 
Statute of limitations
(1
)
 
(1
)
 

Balance at December 31
$
61

 
$
63

 
$
59

Unrecognized Tax Benefits
The following table presents unrecognized tax benefits: 
 
As of December 31,
 
2018
 
2017
Unrecognized tax benefit in non-current income taxes payable (a)
$
41

 
$
46

Accrued interest payable on potential tax liabilities (b)
29

 
26

__________
(a) 
Pursuant to the agreements governing the disposition of certain subsidiaries in 2006, the Company is entitled to indemnification for certain pre-disposition tax contingencies. As of December 31, 2018 and 2017, $13 million of unrecognized tax benefits are related to tax contingencies for which the Company believes it is entitled to indemnification.
(b) 
The Company recognizes potential interest related to unrecognized tax benefits within interest expense related to corporate debt, net on the accompanying Consolidated Statements of Operations. Penalties incurred during the years ended December 31, 2018, 2017 and 2016, were not significant and were recognized as a component of the provision for income taxes.

Vehicle Programs  
Income Taxes [Line Items]  
Deferred Income Tax Assets and Liabilities
Deferred income tax assets and liabilities related to vehicle programs are comprised of the following: 
 
As of December 31,
 
2018
 
2017
Deferred income tax assets:
 
 
 
Depreciation and amortization
$
44

 
$
58

 
 
 
 
Deferred income tax liabilities:
 
 
 
Depreciation and amortization
2,005

 
1,652

Deferred income tax liabilities under vehicle programs, net
$
1,961

 
$
1,594