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Supplemental Financial Information (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Inventories
Finished goods	$ 33	$ 20
Service parts	12	14
Total inventories	45	34
Deferred revenue
Deferred revenue, current	364	369
Long-term deferred revenue	17	14
Total deferred revenue	$ 381	$ 383

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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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