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INVENTORIES (Tables)
3 Months Ended
Mar. 28, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories consisted of the following (in millions):
March 28,
2021
December 31,
2020
Materials, spares and supplies$641 $612 
Work-in-process
2,398 2,693 
Finished goods217 240 
Total inventories$3,256 $3,545