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Note 40 Depreciation And Amortisation Expense (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Tangible assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense € 370,000,000 € 404,000,000
For own use depreciable assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 216,000,000 236,000,000
Right of use assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 152,000,000 166,000,000
Investment property [member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 2,000,000 2,000,000
Other intangible assets [member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 245,000,000 257,000,000
Total [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense € 615,000,000 € 661,000,000