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Cash Flow Detail - Investing Activities, Proceeds and Payments on Financial Investments (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | € 1,413 | € 1,432 | € 2,967
Payments on financial investments not included under cash equivalents | (1,196) | (1,475) | (2,575)
Net proceeds/(payments) for temporary financial investments | 50 | 856 | 1,532
Collateral guarantees on derivatives |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 1,292 | 1,088 | 2,891
Payments on financial investments not included under cash equivalents | (987) | (1,402) | (2,195)
Bond sales in Argentina |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 91 | 9 | 0
Payments on financial investments not included under cash equivalents | (170) | (42) | 0
Legal deposits |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 12 | 31 | 3
Payments on financial investments not included under cash equivalents | (10) | (16) | (4)
Long-term financial instruments of Pegaso PCS |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 0 | 287 | 0
Payments on financial investments not included under cash equivalents | 0 | 0 | (260)
Others |  |  |
Disclosure of associates [line items] |  |  |
Proceeds on financial investments not included under cash equivalents | 18 | 17 | 73
Payments on financial investments not included under cash equivalents | € (29) | € (15) | € (116)

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