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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Components of Inventories

December 31, 2017

December 31, 2016
Total productive material, supplies and work in process
$
4,203


$
5,008

Finished product, including service parts
6,460


6,032

Total inventories
$
10,663


$
11,040