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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
September 30, 2020December 31, 2019
Total productive material, supplies and work in process$5,311 $4,713 
Finished product, including service parts5,623 5,685 
Total inventories$10,934 $10,398