Restructuring and Related Implementation Charges (Details) (Two Thousand Twelve Restructuring Program [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 employees
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 89
Duration Of Restructuring Program	4 years
Percent of Restructuring Charges Resulting In Cash Expenditure	75.00%
Percentage Reduction Of Global Employee Workforce	6.00%
Current Number Of Employees	38,000
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	78
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing 2012 Restructuring Program	50.00%
Incremental Depreciation And Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing 2012 Restructuring Program	15.00%
Charges Resulting Directly From Exit Activities [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing 2012 Restructuring Program	20.00%
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	3
Implementation Of New Strategies [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing 2012 Restructuring Program	15.00%
Third party Incremental Cost [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	8
Pet Nutrition [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	15.00%
Percent Of Total Restructuring Charges Related To Segment	3.00%
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	35.00%
Percent Of Total Restructuring Charges Related To Segment	38.00%
North America [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	15.00%
Percent Of Total Restructuring Charges Related To Segment	2.00%
Europe/South Pacific [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	20.00%
Percent Of Total Restructuring Charges Related To Segment	55.00%
Latin America [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	5.00%
Greater Asia/Africa [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment	10.00%
Percent Of Total Restructuring Charges Related To Segment	2.00%
Expected Completion Date 2016 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax	1,100
Restructuring Program Expected Cost After Tax	775
Expected Completion Date 2016 [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax	1,250
Restructuring Program Expected Cost After Tax	875
Expected Completion Date December 2013 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax	260
Restructuring Program Expected Cost After Tax	185
Expected Completion Date December 2013 [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax	310
Restructuring Program Expected Cost After Tax	$ 220