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Supplemental Financial Information - Inventory (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventory, Net [Abstract]
Work in process and raw materials	$ 174	$ 167
Finished goods	202	171
Service parts	426	430
Total inventories, net	$ 802	$ 768

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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