Contingencies (Details) (Product Liability Litigation [Member])	6 Months Ended	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Zyprexa [Member]
Loss Contingency, Number of Lawsuits		10
Loss Contingency, Number of Plaintiffs		75
Byetta [Member]
Loss Contingency, Number of Lawsuits		115
Loss Contingency, Number of Plaintiffs		500
Loss Contingency, Number of Claimants		500
Loss Contingency, Number of Cases	2
Diethylstilbestrol (DES) [Member]
Loss Contingency, Number of Lawsuits		90
Loss Contingency, Number of Claimants		90
Damages from Product, Breast Cancer [Member] | Diethylstilbestrol (DES) [Member]
Loss Contingency, Number of Plaintiffs		5
Loss Contingency, Number of Claimants		80
Loss Contingency, Number of Cases		5
California [Member] | Byetta [Member]
Loss Contingency, Number of Lawsuits		100
Loss Contingency, Number of Plaintiffs		485