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Supplemental Financial Information - Inventory (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory, Net [Abstract]
Work in process and raw materials	$ 162	$ 187
Finished goods	208	167
Service parts	455	443
Total inventories, net	$ 825	$ 797

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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