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Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Goodwill Information
Goodwill acquired during the period	$ 127
Goodwill acquired during the period which is deductible for tax purposes	39
Increase (decrease) in goodwill related to preliminary allocation of purchase price for prior acquisitions	$ 12

- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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