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Note 39 Depreciation and amortization (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Depreciation [Line Items]    
Depreciation and amortisation expense € 652 € 615
Tangible assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 405 370
For own use depreciable assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 237 216
Right of use assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 166 152
Investment property [member]    
Depreciation [Line Items]    
Depreciation and amortisation expense 2 2
Intangible assets [Member]    
Depreciation [Line Items]    
Depreciation and amortisation expense € 247 € 245