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Short-term trade and other receivables (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 1,625 | € 1,353
Percentage main trade receivables | 100.00% | 100.00%
Public sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 958 | € 870
Percentage main trade receivables | 60.00% | 64.00%
Private sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 533 | € 427
Percentage main trade receivables | 32.00% | 32.00%
Group companies and associates of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 134 | € 55
Percentage main trade receivables | 8.00% | 4.00%
Construction division [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 1,465 | € 1,363
Percentage main trade receivables | 100.00% | 0.00%
Construction division [Member] | Public sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 820 | € 777
Percentage main trade receivables | 57.00% | 0.00%
Construction division [Member] | Private sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 458 | € 414
Percentage main trade receivables | 31.00% | 0.00%
Construction division [Member] | Group companies and associates of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 186 | € 171
Percentage main trade receivables | 12.00% | 0.00%
Other division and adjustments [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € 161 | € (10)
Other division and adjustments [Member] | Public sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | 138 | 93
Other division and adjustments [Member] | Private sector of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | 75 | 13
Other division and adjustments [Member] | Group companies and associates of trade receivables [Member] |  |
Disclosure of the main trade receivables by debtor type [Line Items] |  |
Main trade receivables | € (52) | € (116)

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