v3.25.2
POSTEMPLOYMENT BENEFITS - Change in Projected Benefit Obligations, Plan Assets, and Funded Status, Postretirement (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2023
Dec. 28, 2024
Dec. 30, 2023
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]      
Actuarial (gain) loss $ (11)    
Postretirement Benefits      
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]      
Beginning of year   $ 493 $ 16
Service cost   4 1
Interest cost   24 6
Actuarial (gain) loss   24 (6)
Benefits paid   (48) (10)
End of year 493 449 493
Amounts recognized in accumulated other comprehensive income consist of      
Net amount recognized 20 13 20
Postretirement Benefits | Kellenova Postemployment Benefits      
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]      
Beginning of year   9 0
Spin-Off impacts   0 9
Service cost   1 0
Interest cost   0 0
Actuarial (gain) loss   2 0
Benefits paid   (1) 0
End of year 9 11 9
Amounts recognized in the Consolidated Balance Sheet consist of      
Other current liabilities 1 1 1
Other liabilities 8 10 8
Net amount recognized 9 11 9
Amounts recognized in accumulated other comprehensive income consist of      
Net experience gain 4 2 4
Net amount recognized $ 4 $ 2 $ 4