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Pensions and other benefit plans - Schedule of Defined Benefit Plans Disclosures (Details) - Retirement plans - USD ($) $ in Millions | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 33,395 | $ 33,607 | $ 31,496
Fair Value, Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 33,395 | 33,607 |
Investments Measured at Net Asset Value | 10,277 | 9,967 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 7,144 | 7,776 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 15,809 | 15,729 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 165 | 135 |
Fair Value, Measurements, Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 511 | 841 |
Fair Value, Measurements, Recurring | Short-term investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 12 |
Fair Value, Measurements, Recurring | Short-term investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 511 | 829 |
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 | 7,885 | 5,985 |
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 | 7,885 | 5,985 |
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 | 2,321 | 3,899 |
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 | 2,321 | 3,899 |
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 | 7,144 | 7,764 |
Fair Value, Measurements, Recurring | Equity securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 7,144 | 7,764 |
Fair Value, Measurements, Recurring | Equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 0 | 0 |
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 | 11,231 | 11,682 |
Investments Measured at Net Asset Value | 6,190 | 6,672 |
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 | 5,004 | 4,967 |
Fair Value, Measurements, Recurring | Commingled funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 37 | 43 |
Fair Value, Measurements, Recurring | Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | 4,303 | 3,436 |
Investments Measured at Net Asset Value | 4,087 | 3,295 |
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 | 88 | 49 |
Fair Value, Measurements, Recurring | Other assets | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets | $ 128 | $ 92 |

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