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Note 18 - Intangible assets - Goodwill - Breakdown by CGU and Changes of the year - Reconciliation Of Changes In Goodwill (Details) - EUR (€)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period € 3,846,000,000 € 5,066,000,000 € 4,837,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (22,000,000) 98,000,000 229,000,000
Impairment Loss Recognised In Profit Or Loss Goodwill (2,084,000,000) (1,318,000,000) 0
Companies In The Process Of Sale (1,740,000,000)    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 0 3,846,000,000 5,066,000,000
Turkey [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 346,000,000 382,000,000 509,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (92,000,000) (36,000,000) (127,000,000)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Companies In The Process Of Sale 0    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 254,000,000 346,000,000 382,000,000
Mexico [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 550,000,000 519,000,000 493,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (72,000,000) 31,000,000 26,000,000
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Companies In The Process Of Sale 0    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 478,000,000 550,000,000 519,000,000
Colombia [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 164,000,000 161,000,000 168,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (21,000,000) 3,000,000 (7,000,000)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Companies In The Process Of Sale 0    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 143,000,000 164,000,000 161,000,000
Chile [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 27,000,000 29,000,000 32,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill 0 (2,000,000) (3,000,000)
Impairment Loss Recognised In Profit Or Loss Goodwill 0 0 0
Companies In The Process Of Sale 0    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 27,000,000 27,000,000 29,000,000
Rest [Member]      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 22,000,000 23,000,000 23,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (1,000,000) (1,000,000) 0
Impairment Loss Recognised In Profit Or Loss Goodwill (13,000,000) 0 0
Companies In The Process Of Sale 0    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period 8,000,000 22,000,000 23,000,000
Total Member      
Reconciliation Of Changes In Goodwill Line Items      
Goodwill At The Beggining Of The Period 4,955,000,000 6,180,000,000 6,062,000,000
Intangible Assets and Goodwill      
Additional Recognition Goodwill 0 0 0
Increase Decrease Through Net Exchange Differences Goodwill (208,000,000) 93,000,000 118,000,000
Impairment Loss Recognised In Profit Or Loss Goodwill (2,097,000,000) (1,318,000,000) 0
Companies In The Process Of Sale (1,740,000,000)    
Increase Decrease Through Transfers And Other Changes Goodwill 0 0 0
Goodwill At The End Of The Period € 910,000,000 € 4,955,000,000 € 6,180,000,000