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Income taxes (Details) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 | Dec. 19, 2022 Case | Apr. 28, 2022 USD ($) | May 31, 2021 USD ($)
Income Tax Examination [Line Items] |  |  |  |  |
Effective income tax rate | 17.50% | 11.90% |  |  |
Increase in unrecognized tax benefits resulting from tax positions taken during the current period | $ 60 |  |  |  |
Domestic Tax Authority |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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