Restructuring and Related Implementation Charges (Details) $ in Millions		12 Months Ended
	Oct. 29, 2015	Dec. 31, 2016 USD ($) employees	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Total 2012 Restructuring Program charges, before tax		$ 105	$ 170	$ 195
2012 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Duration of extension of the restructuring program	1 year
Expected Percent of Total Charges Resulting In Cash Expenditure		75.00%
Charges against assets		$ 33	42	31
Total 2012 Restructuring Program charges, before tax		$ 228	254	286
2012 Restructuring Program | Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		10.00%
2012 Restructuring Program | Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		40.00%
2012 Restructuring Program | North America
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		15.00%
2012 Restructuring Program | Europe
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		20.00%
2012 Restructuring Program | Latin America
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
2012 Restructuring Program | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
2012 Restructuring Program | Africa/Eurasia
Restructuring Cost and Reserve [Line Items]
Expected Percent Of Total Restructuring Charges Related To Segment For The Duration Of The Program		5.00%
2012 Restructuring Program | Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		50.00%
Charges against assets		$ 4	17	5
Total 2012 Restructuring Program charges, before tax		$ 61	109	73
2012 Restructuring Program | Incremental Depreciation And Asset Impairment
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		10.00%
2012 Restructuring Program | Charges Resulting Directly From Exit Activities
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		20.00%
2012 Restructuring Program | Implementation Of New Strategies
Restructuring Cost and Reserve [Line Items]
Estimated Percent Of Total Cumulative Pretax Charges Of Implementing Restructuring Program By Category		20.00%
2012 Restructuring Program | Third party Incremental Cost
Restructuring Cost and Reserve [Line Items]
Total 2012 Restructuring Program charges, before tax		$ 116	65	65
2012 Restructuring Program | Contract Termination
Restructuring Cost and Reserve [Line Items]
Total 2012 Restructuring Program charges, before tax		21	8	40
2012 Restructuring Program | Land and Building
Restructuring Cost and Reserve [Line Items]
Total 2012 Restructuring Program charges, before tax		1	$ 47	$ 82
2012 Restructuring Program | Minimum | Expected Completion Date 2017
Restructuring Cost and Reserve [Line Items]
Restructuring program expected cost before tax		1,405
Restructuring Program Total Expected Cost After Tax		1,050
Restructuring Program Expected Cost, Upcoming Fiscal Year, Before Tax		180
Restructuring Program Expected Cost, Upcoming Fiscal Year, After Tax		$ 140
Restructuring and related cost, expected number of positions eliminated (in positions) | employees		3,300
2012 Restructuring Program | Maximum | Expected Completion Date 2017
Restructuring Cost and Reserve [Line Items]
Restructuring program expected cost before tax		$ 1,585
Restructuring Program Total Expected Cost After Tax		1,170
Restructuring Program Expected Cost, Upcoming Fiscal Year, Before Tax		360
Restructuring Program Expected Cost, Upcoming Fiscal Year, After Tax		$ 260
Restructuring and related cost, expected number of positions eliminated (in positions) | employees		3,800