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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, subject to expiry | $ 332 |  |  |
Operating Loss carryforwards, not subject to expiration | 931 |  |  |
Tax credit carryforward, amount | 2,115 |  |  |
Tax credit carryforward, amount, subject to expiration | 74 |  |  |
Tax credit carryforward, amount, not subject to expiry | 2,041 |  |  |
Valuation allowance | 914 | $ 737 | $ 578 | $ 507
Undistributed earnings | 16,400 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 627 | 537 |  |
Accrued interest | 84 | 68 |  |
Interest and penalties | 14 | $ 5 | $ 12 |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 1,295 |  |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 32 |  |  |

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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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