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Revenue and Expenses - Revenues (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Analysis of income and expense [abstract] |  |  |
Rendering of services | € 34,854 | € 34,117 | € 37,394
Sales | 5,139 | 5,160 | 5,682
Total | € 39,993 | € 39,277 | € 43,076

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