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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventories    
Finished goods $ 35 $ 21
Service parts 17 17
Total inventories 52 38
Deferred revenue    
Deferred revenue, current 387 370
Long-term deferred revenue 14 18
Total deferred revenue $ 401 $ 388