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Income taxes - Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, January 1 | $ 82 | $ 69 | $ 89
Additions based on tax positions related to the current year | 3 | 3 | 2
Additions for tax positions of prior years | 0 | 10 | 7
Reductions for tax positions of prior years | (3) | 0 | (6)
Settlements with tax authorities | 0 | 0 | (23)
Expiration of the statute of limitations for assessing taxes | 0 | 0 | 0
Balance, December 31 | 82 | 82 | 69
Interest expense recognized in the year ended December 31 | (9) | (1) | (5)
Interest payable as of December 31 | $ 10 | $ 3 | $ 13

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- Definition Amount of interest benefit (expense) accrued for an overpayment or underpayment of income taxes. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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