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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Components of Inventories
 
March 31, 2019
 
December 31, 2018
Total productive material, supplies and work in process
$
4,685

 
$
4,274

Finished product, including service parts
6,423

 
5,542

Total inventories
$
11,108

 
$
9,816