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Note 45 Depreciation And Amortisation Expense (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Depreciation [Line Items]      
Depreciation and amortisation expense € 1,234 € 1,288 € 1,386
Tangible assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 740 781 876
For own use depreciable assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 437 453 523
Right of use assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 299 324 349
Investment property [member]      
Depreciation [Line Items]      
Depreciation and amortisation expense 3 3 3
Intanbile assets [Member]      
Depreciation [Line Items]      
Depreciation and amortisation expense € 494 € 507 € 510