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Note 45 Depreciation And Amortisation Expense (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Depreciation [Line Items]      
Depreciation and amortisation expense € 1,328 € 1,234 € 1,288
Tangible assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 818 740 781
For own use depreciable assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 501 437 453
Right of use assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 312 299 324
Investment property [member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 5 3 3
Intanbile assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense € 510 € 494 € 507