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Pensions and other benefit plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of corridor of greater of market value of assets | 10.00% |  |
Accumulated benefit obligation unfunded plans | $ 5,800 | $ 2,700 |
Projected benefit obligation, unfunded plans | 6,100 | 2,700 |
Plan with accumulated benefit obligation in excess of plan assets, plan assets | 3,100 | 300 |
Fair value of company's common stock directly held in plan assets | $ 14 | $ 21 |
Percentage of company's common stock to plan asset | 0.00% | 0.10% |
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 33,607 | $ 31,496 | $ 41,909
Other Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 86 | 78 | $ 102
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution to pension plans | 135 |  |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution to pension plans | 133 |  |
Commingled funds | Level 2 | Other Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 86 | $ 78 |
Maximum | Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement plan benefits employee compensation period | 5 years |  |

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