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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information
 
As of
In millions
March 31,
2016
 
December 31,
2015
Inventories
 
 
 
Finished goods
$
37

 
$
32

Service parts
17

 
17

Total inventories
$
54

 
$
49

 
 
 
 
Deferred revenue
 
 
 
Deferred revenue, current
$
506

 
$
367

Long-term deferred revenue
15

 
15

Total deferred revenue
$
521

 
$
382