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Intangible assets - Breakdown of exploration rights by type (Details) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Intangible assets |  |  |
Intangible assets | € 2,936 | € 3,059 | € 3,170
Exploration rights |  |  |
Intangible assets |  |  |
Intangible assets | 888 | 1,031 | € 1,081
Proved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | 225 | 291 |
Unproved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | 653 | 709 |
Other mineral interests |  |  |
Intangible assets |  |  |
Intangible assets | € 10 | € 31 |

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