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Business combinations (Details) (de CODE Genetics [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Dec. 10, 2012
Mar. 31, 2013
de CODE Genetics [Member]
   
Business Combinations (Textual) [Abstract]    
Total consideration $ 401  
Finite-lived intangible assets comprised of databases and other proprietary information 465  
Finite-lived intangible assets, estimated useful life (in years) 10 years  
Goodwill arising from business combinations 45  
Deferred tax liabiities 93  
Other assets and liabilities, net 16  
Reduction in acquisition date fair value of goodwill   48
Increase in acquisition date fair value of finite-lived intangible assets   $ 64