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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventories    
Finished goods $ 7 $ 18
Service parts 10 11
Total inventories 17 29
Deferred revenue    
Current deferred revenue 464 499
Long-term deferred revenue 28 38
Total deferred revenue $ 492 $ 537