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Supplemental Financial Information
9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information
Supplemental Financial Information
 
As of
In millions
September 30,
2018
 
December 31,
2017
Inventories
 
 
 
Finished goods
$
33

 
$
18

Service parts
12

 
12

Total inventories
$
45

 
$
30

 
 
 
 
Deferred revenue
 
 
 
Deferred revenue, current
$
384

 
$
414

Long-term deferred revenue
102

 
85

Total deferred revenue
$
486

 
$
499