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Pension and postretirement benefits - Components of Plan Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 29, 2024
Jun. 29, 2024
Oct. 01, 2023
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2 $ 4 $ 0
Interest cost 7 14  
Expected return on plan assets (9) (18)  
Amortization of unrecognized prior service cost 1 2  
Total pension expense 1 2  
Nonpension postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 2 $ 0
Interest cost 6 12  
Expected return on plan assets (15) (30)  
Amortization of unrecognized prior service cost (2) (4)  
Total pension expense $ (10) $ (20)