Collaborative arrangements Collaborative arrangements (Textuals 5) (Details) (Bayer HealthCare Pharmaceuticals Inc. [Member], Nexavar [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 country
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of countries product is marketed and sold		100
Percentage of development costs funded by Company		50.00%
Percentage of net profits after deducting certain partner related costs		50.00%
Collaboration, net R&D expenses	$ 13
Other Revenues [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaboration profit	$ 78