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Rights of Use - Gross Costs, Accumulated Depreciation, and Impairment Losses of Rights of Use (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | € 7,907 | € 8,448 | € 8,279
Rights of use on land and natural properties |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 815 | 834 | 885
Rights of use on buildings |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 3,900 | 4,287 | 4,130
Rights of use on plant and machinery |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 2,947 | 3,080 | 3,037
Other rights of use |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 245 | 247 | € 227
Cost |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 18,049 | 17,210 |
Cost | Rights of use on land and natural properties |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 2,173 | 2,051 |
Cost | Rights of use on buildings |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 9,525 | 9,411 |
Cost | Rights of use on plant and machinery |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 5,837 | 5,250 |
Cost | Other rights of use |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | 514 | 498 |
Accumulated depreciation |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | (10,142) | (8,762) |
Accumulated depreciation | Rights of use on land and natural properties |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | (1,358) | (1,217) |
Accumulated depreciation | Rights of use on buildings |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | (5,625) | (5,124) |
Accumulated depreciation | Rights of use on plant and machinery |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | (2,890) | (2,170) |
Accumulated depreciation | Other rights of use |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Rights of use | € (269) | € (251) |

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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_j&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
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