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Note 14 - Financial assets at amortised cost- Loans and advances to customers (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Loans And Receivables To Customers Line Items      
Impairment loss € 208 € 158 € 136
Customers [Member] | On demand [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 3,641 10,560 11,251
Customers [Member] | Credit Card Debt [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 15,445 15,835 16,596
Customers [Member] | Trade Receivables [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 17,436 22,705 23,753
Customers [Member] | FinancialLeaseMember [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 8,650 8,642 9,442
Customers [Member] | Repurchase Agreements [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 294 11,554 7,291
Customers [Member] | Other Term Loans [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 324,767 313,336 339,862
Customers [Member] | Advances That Are Not Loans [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 3,794 4,989 6,306
Customers [Member] | Total [Member]      
Disclosure Of Loans And Receivables To Customers Line Items      
Loans And Receivables 374,027 387,621 414,500
Impaired Loans And Receivables 16,349 19,390 22,915
Impairment loss € (12,199) € (12,748) € (15,974)