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Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Goodwill Information
Goodwill acquired during the period	$ 94
Increase (decrease) in goodwill related to preliminary allocation of purchase price for prior acquisitions	12
Purchased finite-lived intangible assets	$ 60

- 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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