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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
June 30, 2018
 
December 31, 2017
Total productive material, supplies and work in process
$
4,267

 
$
4,203

Finished product, including service parts
6,566

 
6,460

Total inventories
$
10,833

 
$
10,663