v3.25.4
Pensions and other benefit plans - Information Related to the Benefit Obligation and the Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 28, 2025
Dec. 29, 2024
Qualified Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets $ 24,057 $ 22,250
Projected Benefit Obligation 19,111 18,146
Accumulated Benefit Obligation 18,867 17,726
Projected Benefit Obligation 4,946 4,104
Accumulated Benefit Obligation 5,190 4,524
Non-Qualified Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Projected Benefit Obligation 2,084 1,990
Accumulated Benefit Obligation 2,064 1,949
Projected Benefit Obligation (2,084) (1,990)
Accumulated Benefit Obligation (2,064) (1,949)
Funded Plans | International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 12,601 11,145
Projected Benefit Obligation 10,910 10,069
Accumulated Benefit Obligation 9,957 9,115
Projected Benefit Obligation 1,691 1,076
Accumulated Benefit Obligation 2,644 2,030
Unfunded Plans | International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Projected Benefit Obligation 139 112
Accumulated Benefit Obligation 111 93
Projected Benefit Obligation (139) (112)
Accumulated Benefit Obligation $ (111) $ (93)