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Supplemental Financial Information (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Inventories
Finished goods	$ 29	$ 21
Service parts	17	17
Total inventories	46	38
Deferred revenue
Deferred revenue, current	444	370
Long-term deferred revenue	17	18
Total deferred revenue	$ 461	$ 388

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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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