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Collaborative arrangements Collaborative arrangements (Textuals 2) (Details) (Collaborative Arrangements With Astrazeneca Plc [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2012
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| Research and Development Arrangement, Contract to Perform for Others [Line Items] | |
| Percentage of related development costs for the 2012-2014 period will be funded by partner | 65.00% |
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Other Revenues [Member]
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| Research and Development Arrangement, Contract to Perform for Others [Line Items] | |
| Milestone payments received | 50 |
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Research and Development Expense [Member]
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| Research and Development Arrangement, Contract to Perform for Others [Line Items] | |
| Cost recoveries | 28 |