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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
March 31, 2021December 31, 2020
Total productive material, supplies and work in process$6,927 $5,117 
Finished product, including service parts5,139 5,118 
Total inventories$12,066 $10,235