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Note 17 - Intangible assets - Goodwill - Breakdown by CGU and Changes of the year - Reconciliation Of Changes In Goodwill (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period € 6,062  
Intangible Assets and Goodwill    
Goodwill at end of period 6,148 € 6,062
United States [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 4,837 5,503
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0
Increase Decrease Through Net Exchange Differences Goodwill 139 (666)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0
Additional Recognition Goodwill 0 0
Goodwill at end of period 4,976 4,837
Turkey [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 509 624
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0
Increase Decrease Through Net Exchange Differences Goodwill (76) (115)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0
Additional Recognition Goodwill 0 0
Goodwill at end of period 433 509
Mexico [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 493 523
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 24
Increase Decrease Through Net Exchange Differences Goodwill 17 (44)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0
Additional Recognition Goodwill 0 (10)
Goodwill at end of period 510 493
Colombia [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 168 191
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0
Increase Decrease Through Net Exchange Differences Goodwill 7 (22)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0
Additional Recognition Goodwill 0 0
Goodwill at end of period 175 168
Chile [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 32 68
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0
Increase Decrease Through Net Exchange Differences Goodwill (1) (3)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0
Additional Recognition Goodwill 0 (33)
Goodwill at end of period 31 32
Rest [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 23 28
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0
Increase Decrease Through Net Exchange Differences Goodwill 0 (1)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 (4)
Additional Recognition Goodwill 0 0
Goodwill at end of period 23 23
Total [Member]    
Reconciliation Of Changes In Goodwill Line Items    
Goodwill at beginning of period 6,062 6,937
Intangible Assets and Goodwill    
Increase Decrease Through Transfers And Other Changes Goodwill 0 24
Increase Decrease Through Net Exchange Differences Goodwill 86 (851)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 (4)
Additional Recognition Goodwill 0 (43)
Goodwill at end of period € 6,148 € 6,062