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Revenue and Expenses - Revenues (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Analysis of income and expense [abstract] |  |  |
Revenues from rendering of services | € 35,480 | € 34,832 | € 34,479
Lease revenues | 79 | 71 | 76
Sale of goods | 5,756 | 5,749 | 5,438
Total | € 41,315 | € 40,652 | € 39,993

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- Definition The amount of operating lease income. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 90 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_90_b&doctype=Standard -URIDate 2024-03-27 + Details
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