Proposed separation transactions	6 Months Ended
	Jul. 02, 2022
Discontinued Operations and Disposal Groups [Abstract]
Proposed spin-off transaction [Text Block]	Proposed separation transactionsOn June 21, 2022, the Company announced its intent to separate its North American cereal and plant-based foods businesses, via tax-free spin-offs, resulting in three independent public companies, each better positioned to unlock their full standalone potential. While we announced a plan to separate our plant-based food business through a tax free spin-off, we are also exploring other strategic alternatives, including a possible sale. Our current target is to complete the transactions by the end of 2023. We cannot assure that the transactions will be completed on the anticipated timeline or at all or that the terms of the separations will not change. The transactions will follow the satisfaction of customary conditions, including reviews and final approval by Kellogg’s Board of Directors, receipt of an Internal Revenue Service ruling and relevant tax opinions with respect to the tax-free nature of the transactions, effectiveness of appropriate filings with the U.S. Securities and Exchange Commission, and the completion of audited financials of the new independent companies.