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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Inventories    
Finished goods $ 37 $ 32
Service parts 17 17
Total inventories 54 49
Deferred revenue    
Deferred revenue, current 506 367
Long-term deferred revenue 15 15
Total deferred revenue $ 521 $ 382