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Intangible assets - Breakdown of exploration rights by type (Details) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Intangible assets |  |  |
Intangible assets | € 3,059 | € 3,170 | € 2,925
Exploration rights |  |  |
Intangible assets |  |  |
Intangible assets | 1,031 | 1,081 | € 995
Proved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | 291 | 357 |
Unproved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | 709 | 684 |
Other mineral interests |  |  |
Intangible assets |  |  |
Intangible assets | € 31 | € 40 |

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