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Supplemental Financial Information
6 Months Ended
Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information
Supplemental Financial Information
 
As of
In millions
June 30,
2015
 
December 31, 2014
Inventories
 
 
 
Finished goods
$
29

 
$
21

Service parts
17

 
17

Total inventories
$
46

 
$
38

 
 
 
 
Deferred revenue
 
 
 
Deferred revenue, current
$
444

 
$
370

Long-term deferred revenue
17

 
18

Total deferred revenue
$
461

 
$
388