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Pensions and other benefit plans - Schedule of Defined Benefit Plans Disclosures (Details) - Retirement plans - USD ($) $ in Millions | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 33,607 | $ 31,496 | $ 41,909
Fair Value, Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 33,607 | 31,496 |
Investments Measured at Net Asset Value | 9,967 | 8,602 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 7,776 | 8,872 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 15,729 | 13,954 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 135 | 68 |
Fair Value, Measurements, Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 841 | 39 |
Fair Value, Measurements, Recurring | Short-term investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 12 | 26 |
Fair Value, Measurements, Recurring | Short-term investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 829 | 13 |
Fair Value, Measurements, Recurring | Short-term investment funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Government and agency securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 5,985 | 5,863 |
Fair Value, Measurements, Recurring | Government and agency securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Government and agency securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 5,985 | 5,863 |
Fair Value, Measurements, Recurring | Government and agency securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Debt instruments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 3,899 | 3,681 |
Fair Value, Measurements, Recurring | Debt instruments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Debt instruments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 3,899 | 3,681 |
Fair Value, Measurements, Recurring | Debt instruments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 7,764 | 8,848 |
Fair Value, Measurements, Recurring | Equity securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 7,764 | 8,846 |
Fair Value, Measurements, Recurring | Equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 2 |
Fair Value, Measurements, Recurring | Equity securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 11,682 | 10,514 |
Investments Measured at Net Asset Value | 6,672 | 6,096 |
Fair Value, Measurements, Recurring | Commingled funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Commingled funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 4,967 | 4,362 |
Fair Value, Measurements, Recurring | Commingled funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 43 | 56 |
Fair Value, Measurements, Recurring | Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 3,436 | 2,551 |
Investments Measured at Net Asset Value | 3,295 | 2,506 |
Fair Value, Measurements, Recurring | Other assets | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
Fair Value, Measurements, Recurring | Other assets | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 49 | 33 |
Fair Value, Measurements, Recurring | Other assets | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 92 | $ 12 |

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