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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories consisted of the following (in millions):
 
 
June 30,
2019

December 31,
2018
Materials, spares and supplies
 
$
452

 
 
$
446

 
Work-in-process
 
2,810

 
 
2,161

 
Finished goods
 
337

 
 
390

 
Total inventories
 
$
3,599

 
 
$
2,997