Restructuring and Related Implementation Charges - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Jul. 31, 2025	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring program period in force	3 years
Productivity Program
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost		$ 0
Global Productivity Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost			$ 77
Minimum | Productivity Program
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax	$ 200
Restructuring program, expected cash expenditures (percent)	75.00%
Minimum | Productivity Program | Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	65.00%
Minimum | Productivity Program | Asset Related Costs And Others
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	25.00%
Minimum | Global Productivity Initiative | Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	10.00%
Minimum | Global Productivity Initiative | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	10.00%
Minimum | Global Productivity Initiative | North America
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Minimum | Global Productivity Initiative | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Minimum | Global Productivity Initiative | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	10.00%
Minimum | Global Productivity Initiative | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	10.00%
Minimum | Global Productivity Initiative | Africa/Eurasia
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	5.00%
Maximum | Productivity Program
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax	$ 300
Restructuring program, expected cash expenditures (percent)	85.00%
Maximum | Productivity Program | Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	75.00%
Maximum | Productivity Program | Asset Related Costs And Others
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	35.00%
Maximum | Global Productivity Initiative | Pet Nutrition
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Maximum | Global Productivity Initiative | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Maximum | Global Productivity Initiative | North America
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	20.00%
Maximum | Global Productivity Initiative | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	20.00%
Maximum | Global Productivity Initiative | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Maximum | Global Productivity Initiative | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	15.00%
Maximum | Global Productivity Initiative | Africa/Eurasia
Restructuring Cost and Reserve [Line Items]
Restructuring program cost before tax (percent)	10.00%