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Note 40 - Depreciation (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization € 606 € 712
Tangible assets [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization 297 355
For Own Use Depreciable Assets [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization 295 348
Investment Property [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization 2 7
Assets Leased Out Under An Operating Lease [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization 0 0
Other Intangible Assets [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization 309 357
Total [Member]    
Depreciation And Amortisation Expense Line Items    
Depreciation and amortization € 606 € 712