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Payables and Other Current Liabilities - Changes in Provision Law 18/2022 (Details) € in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) invoice | Dec. 31, 2023 EUR (€) invoice | Dec. 31, 2022 EUR (€)
Trade And Other Payables [Line Items] |  |  |
Payments to suppliers for goods and services | € 30,360 | € 29,188 | € 29,509
Law 18/2022 | Spain |  |  |
Trade And Other Payables [Line Items] |  |  |
Payments to suppliers for goods and services | € 5,406 | € 4,558 |
Percentage of total payments | 0.64 | 0.58 |
Number of invoices paid in a period less than the maximum established in the regulations | invoice | 157,640 | 141,862 |
Percentage of the total number of invoices paid | 0.58 | 0.51 |

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