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Accounting information and policies (Details) € in Millions, $ in Billions | Jun. 30, 2026 EUR (€) | Jun. 30, 2026 USD ($) | Dec. 31, 2025 EUR (€) | Jun. 30, 2025 EUR (€)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash and cash equivalents | € 4,726 |  | € 3,941 | € 4,344
Cash and cash equivalents held by central finance companies | 1,600 |  |  |
Revolving credit facility 1 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities | 2,600 | $ 5.2 |  |
Revolving credit facility 2 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities | € 2,000 |  |  |

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