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Note 19 Effective tax rate (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated tax group in Spain [Member]      
Effective tax rate [Line Items]      
Effective tax rate € 655 € 259 € (718)
Other Spanish entities [Member]      
Effective tax rate [Line Items]      
Effective tax rate 5 7 7
Foreign entities [Member]      
Effective tax rate [Line Items]      
Effective tax rate 6,587 4,982 7,757
Total effective tax rate [Member]      
Effective tax rate [Line Items]      
Effective tax rate € 7,247 € 5,248 € 7,046
Effective tax rate [Member]      
Effective tax rate [Line Items]      
Percentage effective tax rate 26.30% 27.80% 27.60%