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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
December 31, 2020December 31, 2019
Total productive material, supplies and work in process
$5,117 $4,713 
Finished product, including service parts5,118 5,685 
Total inventories$10,235 $10,398