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Note 45 Depreciation And Amortisation Expense (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Depreciation [Line Items]      
Depreciation and amortisation expense € 1,533 € 1,403 € 1,328
Tangible assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 972 867 818
For own use depreciable assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 623 547 501
Right of use assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 343 317 312
Investment property [member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 5 3 5
Intanbile assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense € 561 € 536 € 510