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Deferred tax - Tax credit recognised in Income statement (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred income tax |  |  |
Deferred tax assets | $ 268,000,000 | $ 283,000,000 |
Credits / (Charged) to the income statement | (1,000,000) | 24,000,000 | $ 15,000,000
Unused tax losses for which no deferred tax asset recognised | 2,900,000,000 | 729,000,000 | 120,000,000
Deferred tax assets not recognised. | 675,000,000 | 155,000,000 | 17,000,000
Provision for temporary difference in investment in subsidiary | 0 |  |
SWITZERLAND |  |  |
Deferred income tax |  |  |
Deferred tax assets | 25,000,000 |  |
Losses Which Do Not Expire [member] |  |  |
Deferred income tax |  |  |
Unused tax losses for which no deferred tax asset recognised | 30,000,000 |  |
Losses Which Expire Between 2029 And 2031 [member] |  |  |
Deferred income tax |  |  |
Unused tax losses for which no deferred tax asset recognised | 64,000,000 |  |
Losses Which Expire Between 2038 And 2041 [member] |  |  |
Deferred income tax |  |  |
Unused tax losses for which no deferred tax asset recognised | 2,800,000,000 |  |
Tax losses |  |  |
Deferred income tax |  |  |
Deferred tax assets | 53,000,000 | 39,000,000 |
Credits / (Charged) to the income statement | 16,000,000 | 14,000,000 | 15,000,000
Employee benefit obligations |  |  |
Deferred income tax |  |  |
Deferred tax assets | 19,000,000 | 23,000,000 |
Credits / (Charged) to the income statement | (1,000,000) | 3,000,000 | 3,000,000
Depreciation timing differences (including leases) |  |  |
Deferred income tax |  |  |
Deferred tax assets | 123,000,000 | 147,000,000 |
Credits / (Charged) to the income statement | (21,000,000) | 26,000,000 | 38,000,000
Provisions |  |  |
Deferred income tax |  |  |
Deferred tax assets | 29,000,000 | 29,000,000 |
Credits / (Charged) to the income statement |  | (3,000,000) | 8,000,000
Other deferred tax assets |  |  |
Deferred income tax |  |  |
Credits / (Charged) to the income statement |  | 20,000,000 | 11,000,000
Intangible assets |  |  |
Deferred income tax |  |  |
Credits / (Charged) to the income statement | 14,000,000 | 10,000,000 | 13,000,000
Accelerated depreciation and other fair value adjustments (including leases) |  |  |
Deferred income tax |  |  |
Credits / (Charged) to the income statement | (8,000,000) | (49,000,000) | (68,000,000)
Other deferred tax liabilities |  |  |
Deferred income tax |  |  |
Credits / (Charged) to the income statement | $ (1,000,000) | $ 3,000,000 | $ (5,000,000)

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