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Pension and postretirement benefits - Contributions to Employee Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2024
Mar. 30, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions to employee benefit plans $ 7 $ 0 $ 0 $ 10 $ 0  
Total current year projected employer contributions 24     24    
Expected future employer contributions, next fiscal year           $ 24
Previously Reported            
Defined Benefit Plan Disclosure [Line Items]            
Expected future employer contributions, next fiscal year           $ 0
Pension            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions to employee benefit plans 7 0 0 10 0  
Total current year projected employer contributions 24     24    
Nonpension postretirement            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions to employee benefit plans 0 $ 0 $ 0 0 $ 0  
Total current year projected employer contributions $ 0     $ 0