CONSOLIDATED STATEMENT OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Income Statement [Abstract]
Net sales	$ 3,200	$ 3,342
Cost of goods sold	2,169	2,358
Selling, general and administrative expense	638	638
Operating profit	393	346
Interest expense	83	70
Other income (expense), net	43	17
Income from continuing operations before income taxes	353	293
Income taxes	82	61
Earnings (loss) from unconsolidated entities	0	2
Net income from continuing operations	271	234
Net income attributable to noncontrolling interests	4	4
Income (loss) from discontinued operations, net of taxes	0	68
Net income attributable to Kellanova	$ 267	$ 298
Earnings per common share - basic
Earnings (loss) from continuing operations - per common share basic	$ 0.78	$ 0.67
Earnings (loss) from discontinued operations - per common share basic	0	0.20
Net earnings (loss) per common share - basic	0.78	0.87
Earnings per common share - diluted
Earnings (loss) from continuing operations - per common share diluted	0.78	0.67
Earnings (loss) from discontinued operations - per common share diluted	0	0.19
Net earnings (loss) per common share - diluted	$ 0.78	$ 0.86
Average shares outstanding:
Basic (in shares)	341	342
Diluted (in shares)	344	345
Actual shares outstanding at period end (in shares)	342	343