Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							24 Months Ended	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2009 Zyprexa [Member]	Dec. 31, 2011 Product Liability Litigation [Member] Zyprexa [Member] lawsuits plaintiffs	Dec. 31, 2009 Product Liability Litigation [Member] Zyprexa [Member]	Dec. 31, 2008 Product Liability Litigation [Member] Zyprexa [Member] states	Dec. 31, 2011 Product Liability Litigation [Member] Byetta [Member] plaintiffs lawsuits	Dec. 31, 2011 Multi District Litigation MDL [Member] Zyprexa [Member] plaintiffs lawsuits	Dec. 31, 2006 Marketing and Promotional Practices [Member] Zyprexa [Member] lawsuits	Dec. 31, 2011 California [Member] Product Liability Litigation [Member] Byetta [Member] lawsuits
Loss Contingency, Number of Claimants						530
Loss Contingency, Number of Lawsuits			40			120	25	4	100
Loss Contingency, Number of Plaintiffs			120			480	30
Loss Contingency, Number of States					13
Product Liability Accrual, Period Expense	$ 230.0	$ 230.0		$ 230.0	$ 15.0