Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Percentage of LIFO Inventory	45.00%
Finished products	$ 786.4	$ 800.8
Work in process	1,518.2	1,714.2
Raw materials and supplies	205.8	220.8
Inventory, Gross, Total	2,510.4	2,735.8
Reduction to LIFO cost	(210.6)	(218.1)
Inventories	2,299.8	2,517.7
Maturity of Foreign Currency Derivatives	12
Finite-Lived Intangible Assets, Useful Life, Minimum	3
Finite-Lived Intangible Assets, Useful Life, Maximum	20
Land	202.5	207.8
Buildings	6,135.7	6,029.3
Equipment	7,219.9	7,355.7
Construction in progress	1,036.0	893.8
Property and equipment, gross	14,594.1	14,486.6
Less accumulated depreciation	(6,833.8)	(6,545.9)
Property and equipment, net	7,760.3	7,940.7
Depreciation	732.4	749.1	813.5
Interest Costs, Capitalized During Period	25.7	26.0	30.2
Operating Leases, Rent Expense	353.4	339.3	337.8
Net product sales	23,604.8	22,442.2	21,171.5
Collaboration and other revenue	681.7	633.8	664.5
Revenue	$ 24,286.5	$ 23,076.0	$ 21,836.0
Building [Member]
Property, Plant and Equipment, Useful Life, Minimum	12
Property, Plant and Equipment, Useful Life, Maximum	50
Equipment [Member]
Property, Plant and Equipment, Useful Life, Minimum	3
Property, Plant and Equipment, Useful Life, Maximum	18