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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventories    
Finished goods $ 14 $ 19
Service parts 12 12
Total inventories 26 31
Deferred revenue    
Current deferred revenue 518 472
Long-term deferred revenue 41 61
Total deferred revenue $ 559 $ 533