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Income taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Dec. 19, 2022 Case | Apr. 28, 2022 USD ($) | May 31, 2021 USD ($) numberOfNotices
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 11.10% | 10.40% | 15.00% | 11.80% |  |  |
Increase in unrecognized tax benefits resulting from tax positions taken during the current period | $ 50 |  | $ 160 |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Number of notices on proposed additional tax | numberOfNotices |  |  |  |  |  |  | 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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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