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Income taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 | Sep. 30, 2024 USD ($) | Sep. 30, 2023 | Dec. 19, 2022 case | Apr. 28, 2022 USD ($) | May 31, 2021 USD ($) notice
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 8.70% | 11.10% | 9.50% | 15.00% |  |  |
Increase in unrecognized tax benefits resulting from tax positions taken during the current period | $ 40 |  | $ 120 |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Number of notices on proposed additional tax | notice |  |  |  |  |  |  | 2
Number of notices consolidated | case |  |  |  |  | 2 |  |
Domestic Tax Authority | Tax Years 2010-2012 |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Proposed additional income tax |  |  |  |  |  |  | $ 3,600
Repatriation tax on proposed additional tax |  |  |  |  |  |  | $ 900
Domestic Tax Authority | Tax Year 2013-2015 |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Proposed additional income tax |  |  |  |  |  | $ 5,100 |
Repatriation tax on proposed additional tax |  |  |  |  |  | 2,200 |
Penalties on proposed additional income tax |  |  |  |  |  | $ 2,000 |

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