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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventories    
Finished goods $ 29 $ 32
Service parts 15 17
Total inventories 44 49
Deferred revenue    
Deferred revenue, current 361 367
Long-term deferred revenue 14 15
Total deferred revenue $ 375 $ 382