Cost savings initiatives and restructuring (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cost savings initiatives and restructuring (Textual) [Abstract]
Impairment of fixed assets	$ 118	$ 6	$ 118	$ 21
Manufacturing operations optimization [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Carrying value of remaining assets	133		133
Manufacturing operations optimization [Member] | Other operating expenses [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Impairment of fixed assets			118
Manufacturing operations optimization [Member] | Cost of sales excludes amortization of certain acquired intangible assets [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Incremental depreciation in excess of what otherwise would have been recorded		42
Charges related to lease period beyond supply period		23
Other cost savings initiatives [Member] | Other operating expenses [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Charges primarily related to severance		109
Restructuring [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Restructuring plan charges				70
Restructuring [Member] | Other operating expenses [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Charges primarily related to severance				25
Restructuring [Member] | Selling, General and Administrative [Member]
Cost savings initiatives and restructuring (Textual) [Abstract]
Other restructuring costs				$ 32