Summary Of Significant Accounting Policies Research and Development Expenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development expense	$ 1,607	$ 1,539	$ 1,204
Company-sponsored R & D, including product development costs
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development expense	374	372	325
Bid And proposal costs
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development expense	170	173	183
Total company-sponsored R & D
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development expense	544	545	508
Customer-sponsored R & D
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and development expense	$ 1,063	$ 994	$ 696

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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