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Pensions and other benefit plans - Information Related to the Benefit Obligation and the Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 29, 2024
Dec. 31, 2023
Qualified Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets $ 22,250 $ 22,298
Projected Benefit Obligation 18,146 19,152
Accumulated Benefit Obligation 17,726 18,557
Projected Benefit Obligation 4,104 3,146
Accumulated Benefit Obligation 4,524 3,741
Non-Qualified Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Projected Benefit Obligation 1,990 2,037
Accumulated Benefit Obligation 1,949 1,982
Projected Benefit Obligation (1,990) (2,037)
Accumulated Benefit Obligation (1,949) (1,982)
Funded Plans | International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 11,145 11,309
Projected Benefit Obligation 10,069 10,431
Accumulated Benefit Obligation 9,115 9,498
Projected Benefit Obligation 1,076 878
Accumulated Benefit Obligation 2,030 1,811
Unfunded Plans | International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Plan Assets 0 0
Projected Benefit Obligation 112 124
Accumulated Benefit Obligation 93 102
Projected Benefit Obligation (112) (124)
Accumulated Benefit Obligation $ (93) $ (102)