Restructuring and Related Implementation Charges - Restructuring Charges Incurred, by Segment (Details) - Global Growth and Efficiency Program	3 Months Ended		6 Months Ended		81 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	100.00%	100.00%	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	1.00%	22.00%	6.00%	21.00%
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	89.00%	56.00%	63.00%	42.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges					41.00%
North America
Restructuring Cost and Reserve [Line Items]
Percent of Total Restructuring Charges Related to Segment	0.00%	8.00%	3.00%	17.00%
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	8.00%	11.00%	21.00%	11.00%
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	(3.00%)	2.00%	1.00%	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	7.00%	(6.00%)	7.00%	1.00%
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	(2.00%)	7.00%	(1.00%)	6.00%
Percent of Restructuring Charges Related to Segment, Program-to-date Accumulated Charges					5.00%