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Note 16 - Tangible assets (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment Abstract    
For own use (PPE) € 6,209 € 6,581
Assets leased out under an operating lease 376 415
Property, plant and equipment 6,585 6,996
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets 151 195
Tangible Assets 6,736 7,191
Land And Buildings [Member]    
Property Plant And Equipment Abstract    
For own use (PPE) 5,372 5,490
Work In Progress Member [Member]    
Property Plant And Equipment Abstract    
For own use (PPE) 214 234
Furniture Fixtures And Vehicles [Member]    
Property Plant And Equipment Abstract    
For own use (PPE) 6,046 6,628
Impairment Of Assets Member [Member]    
Property Plant And Equipment Abstract    
For own use (PPE) (296) (315)
Assets leased out under an operating lease 0 0
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets (15) (20)
Leased Out Under An Operating Lease Member [Member]    
Property Plant And Equipment Abstract    
Assets leased out under an operating lease 452 492
Accrued Depreciation [Member]    
Property Plant And Equipment Abstract    
For own use (PPE) (5,126) (5,456)
Assets leased out under an operating lease (76) (77)
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets (9) (13)
Building rental [Member]    
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets 171 224
Other [Member]    
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets 4 4
Total [Member]    
Property Plant And Equipment Abstract    
Property, plant and equipment 6,585 6,996
Investment Properties Tangible Assets Abstract    
Investment Properties Tangible Assets € 151 € 195