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Deferred Contract Costs
 12 Months Ended
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Deferred Contract Costs
Deferred Contract Costs

Deferred contract costs as of December 31, 2016 and 2015 consists of the following (in millions):
 
2016
 
2015
Installations and conversions in progress
$
57

 
$
34

Installations and conversions completed, net
108

 
93

Sales commissions and other, net
145

 
126

Deferred contract costs, net
$
310

 
$
253



Amortization of deferred contract costs was $87 million, $71 million and $72 million for the years ended December 31, 2016, 2015 and 2014, respectively.