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Supplemental Financial Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finished goods	$ 49	$ 26
Service parts	21	21
Total inventories	70	47
Deferred revenue, current	422	375
Long-term deferred revenue	29	30
Total deferred revenue	$ 451	$ 405

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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