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Accounts receivable - Summary of Gross Value of Overdue Receivables (Details) - EUR (€) € in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | € 522 | € 468
Overdue by less than 1 month |  |
Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | 183 | 184
Overdue by 1-3 months |  |
Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | 127 | 134
Overdue by 3-6 months |  |
Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | 142 | 71
Overdue by 6-12 months |  |
Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | 27 | 27
Overdue by > 12 months |  |
Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] |  |
Overdue receivables gross value | € 43 | € 52

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