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INVENTORIES (Details) - USD ($)
$ in Millions
Jun. 27, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Materials, spares and supplies $ 621 $ 612
Work-in-process 2,290 2,693
Finished goods 208 240
Total inventories 3,119 3,545
Capitalized contract cost $ 693 $ 583