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Accrued Expenses
12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accrued Expenses
(7)Accrued Expenses

 

Accrued expenses consist of the following:

 

   As of December 31, 
   2017   2016 
Accrued payroll and related expenses  $196   $167 
Customer net volume rebate payable   214    201 
Other   133    153 
   $543   $521