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Note 18 - Intangible assets - Goodwill - Breakdown by CGU and Changes of the year - Reconciliation Of Changes In Goodwill (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period € 6,062 € 6,937  
Intangible Assets and Goodwill      
Goodwill at end of period 6,180 6,062 € 6,937
United States [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 4,837 5,503 5,328
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill 229 (666) 175
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Additional Recognition Goodwill 0 0 0
Goodwill at end of period 5,066 4,837 5,503
Turkey [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 509 624 727
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (127) (115) (101)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Additional Recognition Goodwill 0 0 (1)
Goodwill at end of period 382 509 624
Mexico [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 493 523 602
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 24 0
Increase Decrease Through Net Exchange Differences Goodwill 26 (44) (79)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Additional Recognition Goodwill 0 (10) 0
Goodwill at end of period 519 493 523
Colombia [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 168 191 176
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (7) (22) 14
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Additional Recognition Goodwill 0 0 0
Goodwill at end of period 161 168 191
Chile [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 32 68 62
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (3) (3) 6
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Additional Recognition Goodwill 0 (33) 0
Goodwill at end of period 29 32 68
Rest [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 23 28 20
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 8
Increase Decrease Through Net Exchange Differences Goodwill 0 (1) 0
Impairment Loss Recognised In Profit Or Loss Goodwill 0 (4) 0
Additional Recognition Goodwill 0 0 0
Goodwill at end of period 23 23 28
Total [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill at beginning of period 6,062 6,937 6,915
Intangible Assets and Goodwill      
Increase Decrease Through Transfers And Other Changes Goodwill 0 24 8
Increase Decrease Through Net Exchange Differences Goodwill 118 (851) 15
Impairment Loss Recognised In Profit Or Loss Goodwill 0 (4) 0
Additional Recognition Goodwill 0 (43) (1)
Goodwill at end of period € 6,180 € 6,062 € 6,937