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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
A summary of inventories is shown below:
 
December 31,
2018
 
December 31,
2017
 
(in millions)
Productive material
$
724

 
$
584

Work-in-process
101

 
100

Finished goods
452

 
399

Total
$
1,277

 
$
1,083