Acquisitions (Details Textuals) (USD $) In Millions, unless otherwise specified	Mar. 04, 2011 BioVex Group Inc [Member]	Jun. 30, 2011 Other acquisitions [Member]
Acquisitions (Textuals) [Abstract]
Payments to employees of acquired entity to settle unvested employee options	$ 7
Contingent consideration obligations	575
Fair value of contingent consideration obligations	190
Discount rate used to estimate fair value of acquired in process research and development	11.00%
Goodwill on acquisition	170	290
Amortizable intangible assets acquired in business acquisitions		65
Aggregate consideration for business acquisitions	597	453
Property plant equipment acquired in business acquisitions		99
Other assets and (liabilities) acquired, net	$ (2)	$ (1)

Acquisitions.

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For a business acquisition, the discount rate used to estimate fair value of acquired in process research and development.

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Business acquisition, payment to settle unvested employee options for the acquired company.

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The amount of acquisition cost of a business combination allocated to identifiable other assets and liabilities, net.

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Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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