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Income taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective income tax rate reconciliation, increase (decrease), percent | 3.00% | 4.20% | (3.90%) |  |
Decrease in foreign tax credits | $ 400 |  |  |  |
Decrease in foreign tax credits, percent | 2.60% |  |  |  |
Deferred tax assets, tax basis increase of certain assets due to reorganization | $ 300 |  | $ 300 |  |
Effective income tax rate reconciliation, GILTI, amount |  | $ 100 |  |  |
Increase (decrease) in deferred tax liabilities, global intangible low-taxed income (GILTI) |  |  | 300 |  |
Unrecognized tax benefits | 2,485 | 2,020 | 2,485 | $ 3,716 | $ 3,210
Unrecognized tax benefits, interest on income tax expense |  | 217 | 99 | 136 |
Unrecognized tax benefits, interest on income taxes accrued | $ 264 | 274 | 264 |  |
Unrecognized tax benefits, period increase (decrease) |  | $ 200 |  |  |
State and Local Jurisdiction |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent |  | 3.40% |  |  |
Talc | Consumer Health |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Litigation expense |  | $ 5,100 | $ 7,000 | $ 7,000 |
Effective income tax rate reconciliation, tax settlement, percent |  |  |  | 21.10% |

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- Definition Amount of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to global intangible low-taxed income (GILTI). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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