Restructuring and Related Implementation Charges - Restructuring Charges Incurred, by Segment (Details) - Global Growth and Efficiency Program	3 Months Ended		78 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	100.00%	100.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges			100.00%
Hill’s Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	12.00%	19.00%
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	26.00%	10.00%
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	8.00%	37.00%
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	40.00%	12.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges			5.00%
Europe
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	8.00%	2.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges			19.00%
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	6.00%	18.00%
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	0.00%	2.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges			6.00%