Contingencies (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Byetta [Member] | Product Liability Litigation [Member]
Loss Contingency, Number of Lawsuits	275
Loss Contingency, Number of Plaintiffs	700
Prozac [Member] | Product Liability Litigation [Member]
Loss Contingency, Number of Claimants	370
Loss Contingency, Number of Lawsuits	10
Product Liability Litigation [Member] | Byetta [Member]
Loss Contingency, Number of Claimants	460
Damages from Product, Cancer [Member] | Byetta [Member] | Product Liability Litigation [Member]
Loss Contingency, Number of Lawsuits	190
Loss Contingency, Number of Plaintiffs		265
Brazil [Member] | Employee Litigation [Member]
Loss Contingency, Number of Lawsuits	30
California [Member] | Product Liability Litigation [Member] | Byetta [Member]
Loss Contingency, Number of Lawsuits	95
Loss Contingency, Number of Plaintiffs	510