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Supplemental Financial Information Supplemental Financial Information - Inventory (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Inventory, Net [Abstract]
Work in process and raw materials	$ 156	$ 143
Finished goods	231	180
Service parts	423	418
Total inventories, net	$ 810	$ 741

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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