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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
A summary of inventories is shown below:
 
September 30,
2018
 
December 31,
2017
 
 
 
 
 
(in millions)
Productive material
$
772

 
$
584

Work-in-process
105

 
100

Finished goods
481

 
399

Total
$
1,358

 
$
1,083