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Inventories, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Our inventories, net consist of the following (amounts in millions):
 
At December 31,
 
2017
 
2016
Finished goods
$
45

 
$
40

Purchased parts and components
1

 
9

Inventories, net
$
46

 
$
49