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Intangible assets - Breakdown of exploration rights by type (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Intangible assets |  |  |
Intangible assets | € 5,525 | € 4,799 | € 2,936
Exploration rights |  |  |
Intangible assets |  |  |
Intangible assets | 793 | 913 | € 888
Proved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | 104 | 236 |
Unproved licence and leasehold property acquisition costs |  |  |
Intangible assets |  |  |
Intangible assets | € 689 | € 677 |

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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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