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RESTRUCTURING - Restructuring Program Reserves Narrative (Details) - USD ($)
$ in Millions
Jun. 29, 2024
Dec. 30, 2023
Restructuring Cost and Reserve [Line Items]    
Project reserve $ 34 $ 0
Employee Related Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Project reserve 34 $ 0
Europe | Employee Related Costs [Member] | European Cereal Supply Chain Network Reconfiguration    
Restructuring Cost and Reserve [Line Items]    
Project reserve 30  
North America | Employee Related Costs [Member] | North America Frozen Supply Chain Network Reconfiguration    
Restructuring Cost and Reserve [Line Items]    
Project reserve $ 4