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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, subject to expiry | $ 390 |  |  |
Operating Loss carryforwards, not subject to expiration | 734 |  |  |
Tax credit carryforward, amount | 2,603 |  |  |
Tax credit carryforward, amount, subject to expiration | 88 |  |  |
Tax credit carryforward, amount, not subject to expiry | 2,515 |  |  |
Valuation allowance | 1,059 | $ 914 | $ 737 | $ 578
Undistributed earnings | 18,600 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 589 | 627 |  |
Accrued interest | 101 | 84 |  |
Interest and penalties | 20 | $ 14 | $ 5 |
Foreign tax jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 1,087 |  |  |
State and local jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 37 |  |  |

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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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