RESTRUCTURING - Restructuring Program Reserves Narrative (Details) - USD ($) $ in Millions	Mar. 30, 2024	Dec. 30, 2023
Restructuring Cost and Reserve [Line Items]
Project reserve	$ 37	$ 0
Employee Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Project reserve	37	$ 0
Europe | Employee Related Costs [Member] | European Cereal Supply Chain Network Reconfiguration
Restructuring Cost and Reserve [Line Items]
Project reserve	31
North America | Employee Related Costs [Member] | North America Frozen Supply Chain Network Reconfiguration
Restructuring Cost and Reserve [Line Items]
Project reserve	$ 6