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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventories    
Finished goods $ 26 $ 20
Service parts 14 14
Total inventories 40 34
Deferred revenue    
Deferred revenue, current 514 369
Long-term deferred revenue 14 14
Total deferred revenue $ 528 $ 383