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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventories    
Finished goods $ 21 $ 32
Service parts 16 17
Total inventories 37 49
Deferred revenue    
Deferred revenue, current 430 367
Long-term deferred revenue 16 15
Total deferred revenue $ 446 $ 382