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Supplemental Financial Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finished goods $ 44 $ 26
Service parts 23 21
Total inventories 67 47
Deferred revenue, current 374 375
Long-term deferred revenue 26 30
Total deferred revenue $ 400 $ 405