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Revenues (Tables)
12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table presents our revenues disaggregated by product category for each of our segments, AIT and EVM, for the year ended December 31, 2018 (in millions):

 
Year Ended December 31, 2018
 
Product Category
Segment
Tangible Products
 
Services and Software
 
Total
AIT
$
1,298

 
$
125

 
$
1,423

EVM
2,387

 
408

 
2,795

Total
$
3,685

 
$
533

 
$
4,218