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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Components of Inventories
March 31, 2022December 31, 2021
Total productive material, supplies and work in process$8,695 $8,240 
Finished product, including service parts6,143 4,748 
Total inventories$14,838 $12,988