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Income taxes (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 19, 2022 case | Apr. 28, 2022 USD ($) | May 31, 2021 USD ($) notice
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) | $ 48 | $ 235 | $ 93 | $ 836 |  |  |
Income before income taxes | $ 794 | $ 1,614 | $ 726 | $ 5,056 |  |  |
Effective income tax rate | 6.00% | 14.60% | 12.80% | 16.50% |  |  |
Increase in unrecognized tax benefits resulting from tax positions taken during the current period | $ 40 |  | $ 80 |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Number of notices on proposed additional tax | notice |  |  |  |  |  |  | 2
Proposed additional income tax |  |  |  |  |  |  | $ 3,600
Repatriation tax on proposed additional tax |  |  |  |  |  |  | $ 900
Proposed additional income tax 2013-2015 |  |  |  |  |  | $ 5,100 |
Penalties on proposed additional income tax 2013-2015 |  |  |  |  |  | 2,000 |
Repatriation tax on proposed additional tax 2013-2015 |  |  |  |  |  | $ 2,200 |
Number of notices consolidated | case |  |  |  |  | 2 |  |

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