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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consisted of the following (in millions):
20212020
Materials, spares and supplies
$624 $612 
Work-in-process2,163 2,693 
Finished goods194 240 
Total inventories$2,981 $3,545