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Supplemental Financial Information
6 Months Ended
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information Supplemental Financial Information
 As of
In millionsJune 30,
2020
December 31,
2019
Inventories
Finished goods$14  $19  
Service parts12  12  
Total inventories$26  $31  
Deferred revenue
Deferred revenue, current$518  $472  
Long-term deferred revenue41  61  
Total deferred revenue$559  $533