Income taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Millions |
12 Months Ended | ||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Unrecognized Tax Benefits [Roll Forward] | |||
| Balance as of January 1 | $ 167 | $ 161 | $ 128 |
| Increases related to current period tax positions | 2 | 15 | 27 |
| Increases related to prior period tax positions | 14 | 10 | 8 |
| Decreases related to prior period tax positions | (3) | (12) | 0 |
| Decreases related to lapses in statutes of limitations | (40) | (7) | (2) |
| Balance as of December 31 | $ 140 | $ 167 | $ 161 |
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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. No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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