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Supplemental Financial Information - Inventory (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Work in process and raw materials	$ 159	$ 135
Finished goods	207	202
Service parts	454	453
Total inventories, net	$ 820	$ 790

The aggregate carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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