Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Customer	Dec. 31, 2010 Customer	Dec. 31, 2009 Customer
Summary of Significant Accounting Policies (Textual) [Abstract]
Research and Development costs	$ 324	$ 283	$ 231
Number of customer accounted for more than 10% of total Revenue	0	0	0
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage of individual customer accounted for more than consolidated revenue	10.00%

- Definition

The costs incurred 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 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, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

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