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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. 31, 2023 | Jan. 01, 2023
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Qualified Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | $ 22,298 | $ 20,937
Projected Benefit Obligation | 19,152 | 18,394
Accumulated Benefit Obligation | 18,557 | 17,696
Projected Benefit Obligation | 3,146 | 2,543
Accumulated Benefit Obligation | 3,741 | 3,241
Non-Qualified Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 0 | 0
Projected Benefit Obligation | 2,037 | 1,937
Accumulated Benefit Obligation | 1,982 | 1,872
Projected Benefit Obligation | (2,037) | (1,937)
Accumulated Benefit Obligation | (1,982) | (1,872)
Funded Plans | International Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 11,309 | 10,559
Projected Benefit Obligation | 10,431 | 8,982
Accumulated Benefit Obligation | 9,498 | 8,166
Projected Benefit Obligation | 878 | 1,577
Accumulated Benefit Obligation | 1,811 | 2,393
Unfunded Plans | International Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 0 | 0
Projected Benefit Obligation | 124 | 77
Accumulated Benefit Obligation | 102 | 63
Projected Benefit Obligation | (124) | (77)
Accumulated Benefit Obligation | $ (102) | $ (63)

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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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