DERIVATIVE INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair value measurements on a nonrecurring basis (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 29, 2024	Sep. 27, 2025	Sep. 28, 2024	Dec. 28, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property		$ 0	$ 60
Property, Plant and Equipment, Net		3,526		$ 3,234
Current maturities of long-term debt		759		632
Fair Value Of Related Hedge Portion Of Long Term Debt		500		400
Hedging adjustment | Interest rate contracts | Discontinued Hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current maturities of long-term debt		$ (1)		$ 1
North America | North America Frozen Supply Chain Network Reconfiguration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant and Equipment, Net	$ 62
North America | North America Frozen Supply Chain Network Reconfiguration | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	41
North America | COGS | North America Frozen Supply Chain Network Reconfiguration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property	21
Europe | European Cereal Supply Chain Network Reconfiguration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant and Equipment, Net	99
Europe | European Cereal Supply Chain Network Reconfiguration | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure	60
Europe | COGS | European Cereal Supply Chain Network Reconfiguration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property	$ 39