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Cover Page Document - USD ($)
$ / shares in Units, $ in Billions
 12 Months Ended
Dec. 28, 2024
Jan. 25, 2025
Jun. 29, 2024
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 28, 2024    
Document Transition Report false    
Entity File Number 1-4171    
Entity Registrant Name Kellanova    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 38-0710690    
Entity Address, Address Line One 412 N. Wells Street    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60654    
City Area Code 269    
Local Phone Number 961-2000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 16.6
Entity Common Stock, Shares Outstanding   345,215,923  
Closing price per share of common stock     $ 57.68
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Entity Central Index Key 0000055067    
Current Fiscal Year End Date --12-28    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference [Text Block]
Certain information required by the Items comprising Part III of this Report will be incorporated herein by reference from an amendment to this Form 10-K (“Form 10-K/A”) which the registrant intends to file within 120 days after the end of its fiscal year.
    
Common stock      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $.25 par value per share    
Trading Symbol K    
Security Exchange Name NYSE    
1.250% Senior Notes due 2025      
Entity Information [Line Items]      
Title of 12(b) Security 1.250% Senior Notes due 2025    
Trading Symbol K 25    
Security Exchange Name NYSE    
0.500% Senior Notes due 2029      
Entity Information [Line Items]      
Title of 12(b) Security 0.500% Senior Notes due 2029    
Trading Symbol K 29    
Security Exchange Name NYSE    
3.750% Senior Notes due 2034      
Entity Information [Line Items]      
Title of 12(b) Security 3.750% Senior Notes due 2034    
Trading Symbol K 34    
Security Exchange Name NYSE