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Note 45 - Depreciation (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization € 1,208 € 1,387 € 1,426
Tangible assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 594 694 690
For Own Use Depreciable Assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 589 680 667
Investment Property [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 5 13 23
Assets Leased Out Under An Operating Lease [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 0 0 0
Other Intangible Assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 613 694 735
Total [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization € 1,208 € 1,387 € 1,426