Restructuring and Related Implementation Charges (Details) (Two Thousand Twelve Restructuring Program [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Duration Of The Restructuring Program	4 years
Expected Percent Of Total Charges Resulting In Cash Expenditure		75.00%
Employee-Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		50.00%
Incremental Depreciation And Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		10.00%
Charges Resulting Directly From Exit Activities [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		20.00%
Implementation Of New Strategies [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		20.00%
Pet Nutrition [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		10.00%
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		40.00%
North America [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		15.00%
Europe/South Pacific [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		20.00%
Latin America [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
Asia [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
Africa/Eurasia [Member]
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
Expected Completion Date 2016 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax		$ 1,285
Restructuring Program Expected Cost After Tax		950
Restructuring and Related Cost, Positions Eliminated [Abstract]
Restructuring And Related Cost, Expected Number Of Positions Eliminated		2,000
Expected Completion Date 2016 [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax		1,435
Restructuring Program Expected Cost After Tax		1,050
Restructuring and Related Cost, Positions Eliminated [Abstract]
Restructuring And Related Cost, Expected Number Of Positions Eliminated		2,500
Expected Completion Date December 2015 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax		330
Restructuring Program Expected Cost After Tax		245
Expected Completion Date December 2015 [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Program Expected Cost Before Tax		385
Restructuring Program Expected Cost After Tax		$ 285