Restructuring and Related Implementation Charges - Restructuring Charges Incurred, by Segment (Details) - Global Growth and Efficiency Program	12 Months Ended			75 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	100.00%	100.00%	100.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				100.00%
Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	19.00%	6.00%	7.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				8.00%
Corporate
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	37.00%	40.00%	23.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				40.00%
North America
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	18.00%	23.00%	35.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				18.00%
Latin America
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	10.00%	2.00%	5.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				4.00%
Europe
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	(2.00%)	21.00%	12.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				20.00%
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	13.00%	5.00%	4.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				4.00%
Africa/Eurasia
Restructuring Cost and Reserve [Line Items]
Percent of total restructuring charges related to segment	5.00%	3.00%	14.00%
Percent of restructuring charges related to segment, program-to-date accumulated charges				6.00%