CONSOLIDATED STATEMENT OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales from continuing operations	$ 12,749	$ 13,122	$ 12,653
Cost of goods sold	8,204	8,839	8,842
Selling, general, and administrative expense	2,672	2,778	2,600
Operating profit	1,873	1,505	1,211
Interest expense	311	303	201
Other income (expense), net	92	(162)	(108)
Income from continuing operations before income taxes	1,654	1,040	902
Income taxes	304	258	180
Earnings (loss) from unconsolidated entities	6	6	9
Net income from continuing operations	1,356	788	731
Net income (loss) attributable to noncontrolling interests	13	13	2
Income from discontinued operations, net of taxes	0	176	231
Net income attributable to Kellanova	$ 1,343	$ 951	$ 960
Earnings from continuing operations, per basic share	$ 3.92	$ 2.27	$ 2.14
Earnings from discontinued operations, per basic share	0	0.51	0.67
Net Earnings Per Common Share - Basic	3.92	2.78	2.81
Earnings from continuing operations, per diluted share	3.88	2.25	2.12
Earnings from discontinued operations, per diluted share	0	0.51	0.67
Net Earnings Per Common Share - Diluted	$ 3.88	$ 2.76	$ 2.79