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RESTRUCTURING - Restructuring Program Reserves Narrative (Details) - USD ($)
$ in Millions
Sep. 27, 2025
Dec. 28, 2024
Restructuring Cost and Reserve [Line Items]    
Project reserve $ 41 $ 37
Employee Related Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Project reserve 41 $ 37
Europe | Employee Related Costs [Member] | European Cereal Supply Chain Network Reconfiguration    
Restructuring Cost and Reserve [Line Items]    
Project reserve $ 41