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Non-current assets (Details) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Gains Or Losses On Assets Held For Sale [Line Items]      
TANGIBLE ASSETS € 33,755 € 26,157  
Other assets 12,140 9,348  
Total non-current assets held for sale 4,535 € 5,426  
Non-current assets held for sale [member]      
Gains Or Losses On Assets Held For Sale [Line Items]      
TANGIBLE ASSETS 4,535   € 5,424
Other assets     2
Total non-current assets held for sale 4,535   5,426
Non-current assets held for sale [member] | Foreclosed assets      
Gains Or Losses On Assets Held For Sale [Line Items]      
TANGIBLE ASSETS 4,450   5,334
Non-current assets held for sale [member] | Other assets Member      
Gains Or Losses On Assets Held For Sale [Line Items]      
TANGIBLE ASSETS 85   90
Non-current assets held for sale [member] | SPAIN | Foreclosed assets      
Gains Or Losses On Assets Held For Sale [Line Items]      
TANGIBLE ASSETS € 3,606   € 4,488