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Supplemental Financial Information (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Inventories
Finished goods	$ 29	$ 20
Service parts	13	14
Total inventories	42	34
Deferred revenue
Deferred revenue, current	431	369
Long-term deferred revenue	10	14
Total deferred revenue	$ 441	$ 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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