Certain Changes in Total Equity (Detail) (USD $)	6 Months Ended													0 Months Ended	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2013 Accumulated Translation Adjustment [Member]		Jun. 30, 2013 Accumulated Net Gain (Loss) From Derivative Financial Instruments [Member]		Jun. 30, 2013 Net Unrealized Gain/(Losses) [Member]		Jun. 30, 2013 Accumulated Defined Benefit Plans Adjustment, Actuarial Gains / (Losses) [Member]		Jun. 30, 2013 Accumulated Defined Benefit Plans Adjustment, Prior Service (Costs) / Credits and Other [Member]		Jun. 24, 2013 Zoetis [Member]	Feb. 06, 2013 Zoetis [Member] IPO [Member]	Jun. 30, 2013 Zoetis [Member] Exchange offer [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds from issuance of common stock														$ 2,300,000,000
Noncontrolling interest, ownership percentage by noncontrolling owners														19.80%
Treasury Stock, Value, Acquired, Cost Method	7,900,000,000														11,400,000,000
Noncontrolling Interest, Ownership Percentage by Parent													80.20%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 31, 2012	(5,953,000,000)		(177,000,000)		(88,000,000)		163,000,000		(6,110,000,000)		259,000,000
Other comprehensive income/(loss)	(512,000,000)	[1]	(942,000,000)	[1]	59,000,000	[1]	25,000,000	[1]	370,000,000	[1]	(24,000,000)	[1]
Balance, June 30, 2013	$ (6,465,000,000)		$ (1,119,000,000)		$ (29,000,000)		$ 188,000,000		$ (5,740,000,000)		$ 235,000,000

[1] Amounts do not include foreign currency translation loss of $24 million attributable to noncontrolling interests for the first six months of 2013.