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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
March 31, 2018
 
December 31, 2017
Total productive material, supplies and work in process
$
4,736

 
$
4,203

Finished product, including service parts
6,725

 
6,460

Total inventories
$
11,461

 
$
10,663