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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Supplemental Financial Information
 
As of
In millions
March 31,
2020
 
December 31,
2019
Inventories
 
 
 
Finished goods
$
17

 
$
19

Service parts
11

 
12

Total inventories
$
28

 
$
31

 
 
 
 
Deferred revenue
 
 
 
Deferred revenue, current
$
555

 
$
472

Long-term deferred revenue
44

 
61

Total deferred revenue
$
599

 
$
533