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Income taxes - Valuation Allowance Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2024 | Dec. 31, 2023
Valuation Allowance [Roll Forward] |  |
Beginning of year | $ 1,149 | $ 775
Provision | 451 | 355
Utilization | 0 | (116)
Foreign currency translation | (46) | 25
Net acquisitions / (dispositions/liquidations) | 84 | 110
End of year | $ 1,638 | $ 1,149

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- Definition Valuation Allowance, Deferred Tax Asset, Foreign Currency Translation + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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