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Supplemental Financial Information
9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Financial Information Supplemental Financial Information
 As of
In millionsSeptember 30,
2020
December 31,
2019
Inventories
Finished goods$$19 
Service parts11 12 
Total inventories$14 $31 
Deferred revenue
Deferred revenue, current$482 $472 
Long-term deferred revenue38 61 
Total deferred revenue$520 $533