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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 
 
2019

 
2018

Materials, spares and supplies
 
$
532

 
$
446

Work-in-process
 
2,783

 
2,161

Finished goods
 
304

 
390

Total inventories
 
$
3,619

 
$
2,997