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Supplemental Financial Information
6 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information Supplemental Financial Information
 As of
In millionsJune 30,
2021
December 31,
2020
Inventories
Finished goods$10 $18 
Service parts10 11 
Total inventories$20 $29 
Deferred revenue
Deferred revenue, current$544 $499 
Long-term deferred revenue41 38 
Total deferred revenue$585 $537