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Supplemental Financial Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finished goods $ 27 $ 39
Service parts 17 17
Total inventories 44 56
Deferred revenue, current 380 390
Long-term deferred revenue 22 25
Total deferred revenue $ 402 $ 415