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Accounts Payable and Other Current Liabilities Accounts Payable and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Accounts payable and other current liabilities consisted of: 
 
As of December 31,
 
2018
 
2017
Accounts payable
$
371

 
$
359

Accrued sales and use taxes
208

 
218

Accrued payroll and related
200

 
176

Accrued advertising and marketing
192

 
190

Public liability and property damage insurance liabilities – current
149

 
145

Deferred revenue – current
140

 
135

Accrued insurance
91

 
103

Other
342

 
293

Accounts payable and other current liabilities
$
1,693

 
$
1,619