Contingencies (Details)	3 Months Ended
	Jun. 30, 2013
Product Liability Litigation [Member] | Byetta [Member]
Loss Contingency, Number of Lawsuits	170
Loss Contingency, Number of Plaintiffs	550
Loss Contingency, Number of Claimants	460
Product Liability Litigation [Member] | Diethylstilbestrol (DES) [Member]
Loss Contingency, Number of Lawsuits	80
Loss Contingency, Number of Claimants	80
Product Liability Litigation [Member] | Prozac [Member]
Loss Contingency, Number of Lawsuits	10
Loss Contingency, Number of Claimants	380
Product Liability Litigation [Member] | Damages from Product, Breast Cancer [Member] | Diethylstilbestrol (DES) [Member]
Loss Contingency, Number of Claimants	75
Product Liability Litigation [Member] | California [Member] | Byetta [Member]
Loss Contingency, Number of Lawsuits	85
Loss Contingency, Number of Plaintiffs	465
Employee Litigation [Member] | Brazil [Member]
Loss Contingency, Number of Lawsuits	30