REPORTABLE SEGMENTS - Supplemental Product Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Segment Reporting Information [Line Items]
Net sales	$ 3,192	$ 3,351	$ 6,392	$ 6,693
Snacks
Segment Reporting Information [Line Items]
Net sales	2,069	2,052	4,084	4,074
Cereal
Segment Reporting Information [Line Items]
Net sales	689	707	1,376	1,386
Frozen
Segment Reporting Information [Line Items]
Net sales	262	265	552	557
Noodles and other
Segment Reporting Information [Line Items]
Net sales	$ 172	$ 327	$ 380	$ 676

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details