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Deferred Contract Costs
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Deferred Contract Costs
Deferred Contract Costs

Deferred contract costs as of December 31, 2017 and 2016 consists of the following (in millions):
 
2017
 
2016
Installations and conversions in progress
$
66

 
$
57

Installations and conversions completed, net
120

 
108

Sales commissions and other, net
176

 
145

Deferred contract costs, net
$
362

 
$
310



Amortization of deferred contract costs was $118 million, $87 million and $71 million for the years ended December 31, 2017, 2016 and 2015, respectively.