REPORTABLE SEGMENTS - Supplemental product information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales from continuing operations	$ 12,749	$ 13,122	$ 12,653
Snacks
Segment Reporting Information [Line Items]
Net sales from continuing operations	8,120	8,105	7,563
Retail Channel Cereal
Segment Reporting Information [Line Items]
Net sales from continuing operations	2,700	2,736	2,618
Frozen
Segment Reporting Information [Line Items]
Net sales from continuing operations	1,096	1,095	1,097
Noodles and other
Segment Reporting Information [Line Items]
Net sales from continuing operations	$ 833	$ 1,186	$ 1,375