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Note 45 - Depreciation (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization € 1,288,000,000 € 1,386,000,000 € 1,034,000,000
Tangible assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 781,000,000 876,000,000 533,000,000
For Own Use Depreciable Assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 453,000,000 523,000,000 529,000,000
Asset Use Right [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 324,000,000 349,000,000  
Investment Property [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 3,000,000 3,000,000 5,000,000
Intangible Assets [Member]      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization 507,000,000 510,000,000 500,000,000
Total Member      
Depreciation And Amortisation Expense Line Items      
Depreciation and amortization € 1,288,000,000 € 1,386,000,000 € 1,034,000,000