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Business Combinations (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Mar. 04, 2011
BioVex Group Inc [Member]
Dec. 31, 2011
Laboratorio Quimco Farmaceutico Bergamo Ltda [Member]
Dec. 31, 2011
Other acquisitions [Member]
Business Combinations (Textual) [Abstract]        
Contingent consideration obligations   $ 575    
Estimated aggregate fair value of the contingent consideration obligations   190    
Discount rate used to estimate fair value of acquired in process research and development   11.00%    
Goodwill arising from business combinations   170   265
Tax deductible portion of goodwill arising from a business combination     130  
Aggregate acquisition date consideration for business combinations   597   453
Property plant equipment acquired in business combinations       99
Amortizable intangible assets acquired in business combinations       58
Other assets (liabilities) acquired, net   (2)   31
Goodwill, other increases (decreases) $ (19)