Contingencies and Environmental Liabilities - Vytorin/Zetia Litigation - Textual (Detail) (USD $)	12 Months Ended		1 Months Ended		12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2013 ENHANCE Litigation Merck Defendants [Member]	Feb. 28, 2013 ENHANCE Litigation Schering Plough Defendants [Member]	Dec. 31, 2013 ENHANCE Litigation Schering Plough Defendants [Member]	Jun. 30, 2013 ENHANCE Litigation [Member]	Dec. 31, 2013 ENHANCE Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement agreement amount			$ 215,000,000	$ 473,000,000
Litigation charges	(493,000,000)	(500,000,000)					493,000,000
Insurance recoveries receivable					195,000,000
Payments for legal settlements		500,000,000				480,000,000
Insurance recoveries					$ 208,000,000		$ 13,000,000