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Nota 44 - Administration Costs - Average Number Of Employees By Geographical Area - Gender Of Employees (Details) - Employee
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Male | Management team [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 1,197 1,244 1,331
Male | Other line personel [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 37,461 38,670 38,514
Male | Clerical staff [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 19,315 20,639 22,066
Male | Total [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 57,973 60,553 61,911
Female | Management team [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 339 342 350
Female | Other line personel [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 38,918 39,191 39,213
Female | Clerical staff [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 28,397 31,770 33,318
Female | Total [Member]      
Disclosure number Of Employees At The Period End Profesional Category And Gender      
Average Number Of Employees 67,654 71,303 72,881