CONSOLIDATED STATEMENT OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Income Statement [Abstract]
Net sales	$ 3,083	$ 3,200
Cost of goods sold	2,024	2,169
Selling, general and administrative expense	629	638
Operating profit	430	393
Interest expense	63	83
Other income (expense), net	11	43
Income before income taxes	378	353
Income taxes	73	82
Earnings (loss) from unconsolidated entities	3	0
Net income (loss)	308	271
Net income attributable to noncontrolling interests	4	4
Net income attributable to Kellanova	$ 304	$ 267
Earnings per common share - basic
Net earnings (loss) per common share - basic	$ 0.88	$ 0.78
Earnings per common share - diluted
Net earnings (loss) per common share - diluted	$ 0.87	$ 0.78
Average shares outstanding:
Basic (in shares)	346	341
Diluted (in shares)	349	344
Actual shares outstanding at period end (in shares)	347	342