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Deferred Contract Costs (Tables)
12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Deferred Contract Costs
as of December 31, 2017 and 2016 consisted of the following (in millions):
 
2017
 
2016
Installations and conversions in progress
104

 
87

Incremental contract origination costs completed, net
127

 
96

Costs to fulfill a contract, net
123

 
117

Total deferred contract costs, net
$
354

 
$
300