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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
December 31, 2021December 31, 2020
Total productive material, supplies and work in process
$8,240 $5,117 
Finished product, including service parts4,748 5,118 
Total inventories$12,988 $10,235