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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
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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)

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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