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Supplemental Financial Information
6 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information Supplemental Financial Information
 
As of
In millions
June 30,
2019
 
December 31,
2018
Inventories
 
 
 
Finished goods
$
23

 
$
16

Service parts
12

 
12

Total inventories
$
35

 
$
28

 
 
 
 
Deferred revenue
 
 
 
Deferred revenue, current
$
498

 
$
490

Long-term deferred revenue
82

 
105

Total deferred revenue
$
580

 
$
595