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Investment in associates variation in these investments (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Sep. 30, 2024 EUR (€)
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method | € 3,023 |  | € 2,038 | € 1,951 | € 3,023
Share capital contributions investments in associates | 1,192 |  | 214 |  |
Share of profit (loss) of associates accounted for using equity method | 238 |  | 215 | 165 |
Dividends investment associates | (357) |  | (321) |  |
Increase decrease through net exchange differences of investment associates equity method | 60 |  | (33) |  |
Derivatives investment in associates | 20 |  | 17 |  |
Increase decrease in investments in associates other | (168) |  | (5) |  |
FGP Topco limited [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | 0 | 0 |
Share capital contributions investments in associates |  |  | 0 |  |
Share of profit (loss) of associates accounted for using equity method |  |  | 0 |  |
Dividends investment associates |  |  | 0 |  |
Increase decrease through net exchange differences of investment associates equity method |  |  | 0 |  |
Derivatives investment in associates |  |  | 0 |  |
Increase decrease in investments in associates other |  |  | 0 |  |
407 International Inc [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | 928 | 1,063 | 778
Share capital contributions investments in associates | 0 |  | 0 |  |
Share of profit (loss) of associates accounted for using equity method | 188 |  | 154 |  |
Dividends investment associates | (321) |  | (281) |  |
Increase decrease through net exchange differences of investment associates equity method | (17) |  | (8) |  |
Derivatives investment in associates | 0 |  | 0 |  |
Increase decrease in investments in associates other | 0 |  | 0 |  |
AGS airports holdings limited [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | 0 | 0 |
Share capital contributions investments in associates |  |  | 0 |  |
Share of profit (loss) of associates accounted for using equity method |  |  | 0 |  |
Dividends investment associates |  |  | 0 |  |
Increase decrease through net exchange differences of investment associates equity method |  |  | 0 |  |
Derivatives investment in associates |  |  | 0 |  |
Increase decrease in investments in associates other |  |  | 0 |  |
IRB infrastructure developers limited [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | 376 | 377 | 315
Share capital contributions investments in associates | 0 |  | 0 |  |
Share of profit (loss) of associates accounted for using equity method | 13 |  | 14 |  |
Dividends investment associates | (6) |  | (1) |  |
Increase decrease through net exchange differences of investment associates equity method | 16 |  | (14) |  |
Derivatives investment in associates | (4) |  | 1 |  |
Increase decrease in investments in associates other | (80) |  | (1) |  |
JFKNTO sponsor aggregator LLC [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | 471 | 235 | 1,006
Share capital contributions investments in associates | 469 | $ 507 | 214 |  |
Share of profit (loss) of associates accounted for using equity method | 3 |  | 4 |  |
Dividends investment associates | 0 |  | 0 |  |
Increase decrease through net exchange differences of investment associates equity method | 54 |  | (12) |  |
Derivatives investment in associates | 9 | $ 20 | 31 |  |
Increase decrease in investments in associates other | 0 |  | (1) |  |
Other companies [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method | 220 |  | 263 | € 276 | 220
Share capital contributions investments in associates | 13 |  | 0 |  |
Share of profit (loss) of associates accounted for using equity method | 42 |  | 43 |  |
Dividends investment associates | (26) |  | (39) |  |
Increase decrease through net exchange differences of investment associates equity method | 1 |  | 1 |  |
Derivatives investment in associates | 15 |  | (15) |  |
Increase decrease in investments in associates other | (88) |  | (3) |  |
IRB Infrastructure Trust (Private InvIT) [Member] |  |  |  |  |
Investment in associates equity method item [Line Items] |  |  |  |  |
Investments in associates accounted for using equity method |  |  | € 0 |  | € 704
Share capital contributions investments in associates | 710 |  |  |  |
Share of profit (loss) of associates accounted for using equity method | (8) |  |  |  |
Dividends investment associates | (4) |  |  |  |
Increase decrease through net exchange differences of investment associates equity method | 6 |  |  |  |
Derivatives investment in associates | 0 |  |  |  |
Increase decrease in investments in associates other | € 0 |  |  |  |

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