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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
June 30, 2021December 31, 2020
Total productive material, supplies and work in process$8,124 $5,117 
Finished product, including service parts4,978 5,118 
Total inventories$13,102 $10,235