Income taxes - Uncertain tax positions (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Balance, January 1 | $ 69 | $ 89 | $ 303 |
| Additions based on tax positions related to the current year | 3 | 2 | 3 |
| Additions for tax positions of prior years | 10 | 7 | 35 |
| Reductions for tax positions of prior years | 0 | (6) | (249) |
| Settlements with tax authorities | 0 | (23) | 0 |
| Expiration of the statute of limitations for assessing taxes | 0 | 0 | (3) |
| Balance, December 31 | 82 | 69 | 89 |
| Interest income (expense) recognized in the year ended December 31 | (1) | (5) | 39 |
| Interest payable as of December 31 | $ 3 | $ 13 | $ 8 |
| X | ||||||||||
- Definition Amount of interest benefit (expense) for an overpayment or underpayment of income taxes. No definition available.
|
| X | ||||||||||
- Definition Amount of interest benefit (expense) accrued for an overpayment or underpayment of income taxes. No definition available.
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- 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/disclosureRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- 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/disclosureRef
|
| X | ||||||||||
- 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/disclosureRef
|
| X | ||||||||||
- 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
|