Restructuring and Related Implementation Charges - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Other Retiree Benefits
Restructuring Cost and Reserve [Line Items]
Postretirement benefit enhancements		$ 7	$ 7	$ 14	$ 14
Strategic Growth and Productivity Program
Restructuring Cost and Reserve [Line Items]
Productivity program, term	3 years
Strategic Growth and Productivity Program \| Employee-Related Costs \| Other Retiree Benefits
Restructuring Cost and Reserve [Line Items]
Postretirement benefit enhancements				5
Strategic Growth and Productivity Program \| Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax		$ 350		$ 350
Restructuring and related cost, expected cost, cash (percent)		80.00%		80.00%
Strategic Growth and Productivity Program \| Minimum \| Hill's Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		10.00%		10.00%
Strategic Growth and Productivity Program \| Minimum \| Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		20.00%		20.00%
Strategic Growth and Productivity Program \| Minimum \| North America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		5.00%		5.00%
Strategic Growth and Productivity Program \| Minimum \| Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		15.00%		15.00%
Strategic Growth and Productivity Program \| Minimum \| Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		25.00%		25.00%
Strategic Growth and Productivity Program \| Minimum \| Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		10.00%		10.00%
Strategic Growth and Productivity Program \| Minimum \| Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		70.00%		70.00%
Strategic Growth and Productivity Program \| Minimum \| Asset-Related Costs and Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		20.00%		20.00%
Strategic Growth and Productivity Program \| Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax		$ 550		$ 550
Restructuring and related cost, expected cost, cash (percent)		90.00%		90.00%
Strategic Growth and Productivity Program \| Maximum \| Hill's Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		15.00%		15.00%
Strategic Growth and Productivity Program \| Maximum \| Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		25.00%		25.00%
Strategic Growth and Productivity Program \| Maximum \| North America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		10.00%		10.00%
Strategic Growth and Productivity Program \| Maximum \| Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		20.00%		20.00%
Strategic Growth and Productivity Program \| Maximum \| Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		30.00%		30.00%
Strategic Growth and Productivity Program \| Maximum \| Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		15.00%		15.00%
Strategic Growth and Productivity Program \| Maximum \| Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		80.00%		80.00%
Strategic Growth and Productivity Program \| Maximum \| Asset-Related Costs and Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost (in percent)		30.00%		30.00%