Income taxes - Deferred income tax expense (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Income taxes [Abstract] | |||
| Recognition of previously unrecognized tax loss and credit carryforwards | € 33 | € 5 | € 72 |
| Unrecognized tax loss and credit carryforwards | (26) | (351) | (41) |
| Changes to recognition of temporary differences | 19 | (602) | (112) |
| Prior year tax (expense) benefit | (9) | (13) | (2) |
| Tax rate changes | (12) | 2 | 4 |
| Origination and reversal of temporary differences, tax losses and tax credits | 19 | 136 | 353 |
| Deferred tax (expense) benefit | € 24 | € (823) | € 274 |
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Changes to Recognition of Tax Loss and Credit Carry Forwards No definition available.
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- Definition Changes to Recognition of Temporary Differences No definition available.
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- Definition Income taxes [Abstract] No definition available.
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