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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net Inventories consisted of the following (in millions):
 
 
March 31,
2019

December 31,
2018
Materials, spares and supplies
 
$
438

 
 
$
446

 
Work-in-process
 
2,495

 
 
2,161

 
Finished goods
 
352

 
 
390

 
Total inventories
 
$
3,285

 
 
$
2,997