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Income taxes - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |
Income tax liabilities with federal taxing authority settled through year | 2011 |
Income tax liabilities with state and foreign jurisdictions estimated settlement year | 2024 |
Unrecognized tax benefits | $ 480 | $ 440
Unrecognized tax benefits that would impact effective tax rate | $ 420 |
Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Income Tax Examination, Year under Examination | 2014 |
Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Income Tax Examination, Year under Examination | 2019 |
Tax Year 2012 [Member] |  |
Income Taxes [Line Items] |  |
Income Tax Examination, Year under Examination | 2012 |
Tax Year 2013 [Member] |  |
Income Taxes [Line Items] |  |
Income Tax Examination, Year under Examination | 2013 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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