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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
20202019
Materials, spares and supplies
$612 $532 
Work-in-process2,693 2,783 
Finished goods240 304 
Total inventories$3,545 $3,619