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Income taxes - Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, January 1 | $ 89 | $ 303 | $ 286
Additions based on tax positions related to the current year | 2 | 3 | 3
Additions for tax positions of prior years | 7 | 35 | 63
Reductions for tax positions of prior years | (6) | (249) | (41)
Settlements with tax authorities | (23) | 0 | (8)
Expiration of the statute of limitations for assessing taxes | 0 | (3) | 0
Balance, December 31 | 69 | 89 | 303
Interest income (expense) recognized in the year ended December 31 | (5) | 39 | 9
Interest payable as of December 31 | $ 13 | $ 8 | $ 44

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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