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Note 7 - Risk Management - Past due but not impaired and impaired secured loans risks (I) (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets € 17,134 € 20,590 € 23,877 € 26,103
Debt Securities [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Debt Securities [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Debt Securities [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Debt Securities [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   66 272  
Debt Securities [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   38 128  
Debt Securities [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (28) (144)  
Debt Securities [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (21) (46)  
Debt Securities [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 (1)  
Debt Securities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Debt Securities [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 5      
Loans and receivables [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   3,432 3,384  
Loans and receivables [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   759 696  
Loans and receivables [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   503 735  
Loans and receivables [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   19,401 22,925  
Loans and receivables [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   10,726 12,133  
Loans and receivables [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (8,675) (10,793)  
Loans and receivables [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (4,109) (5,224)  
Loans and receivables [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (29,938) (29,346)  
Loans and receivables [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,191      
Loans and receivables [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 454      
Loans and receivables [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,261      
Loans and receivables [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3,228      
Loans and receivables [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 407      
Loans and receivables [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 900      
Loans and receivables [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,769      
Loans and receivables [Member] | Central Banks [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Central Banks [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Central Banks [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | General Government [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   75 66  
Loans and receivables [Member] | General Government [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   3 0  
Loans and receivables [Member] | General Government [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   13 2  
Loans and receivables [Member] | General Government [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   171 295  
Loans and receivables [Member] | General Government [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   129 256  
Loans and receivables [Member] | General Government [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (42) (39)  
Loans and receivables [Member] | General Government [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (69) (13)  
Loans and receivables [Member] | General Government [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (27) (13)  
Loans and receivables [Member] | General Government [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 95      
Loans and receivables [Member] | General Government [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 7      
Loans and receivables [Member] | General Government [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | General Government [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 5      
Loans and receivables [Member] | General Government [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1      
Loans and receivables [Member] | General Government [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | General Government [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 5      
Loans and receivables [Member] | General Government [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 5      
Loans and receivables [Member] | General Government [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 26      
Loans and receivables [Member] | Credit Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 3  
Loans and receivables [Member] | Credit Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Loans and receivables [Member] | Credit Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 82  
Loans and receivables [Member] | Credit Institutions [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   11 10  
Loans and receivables [Member] | Credit Institutions [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   5 3  
Loans and receivables [Member] | Credit Institutions [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (6) (7)  
Loans and receivables [Member] | Credit Institutions [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (30) (36)  
Loans and receivables [Member] | Credit Institutions [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (5) (5)  
Loans and receivables [Member] | Credit Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3      
Loans and receivables [Member] | Credit Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Credit Institutions [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   2 4  
Loans and receivables [Member] | Other Financial Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 7  
Loans and receivables [Member] | Other Financial Institutions [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 21  
Loans and receivables [Member] | Other Financial Institutions [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   12 34  
Loans and receivables [Member] | Other Financial Institutions [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   6 8  
Loans and receivables [Member] | Other Financial Institutions [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (7) (25)  
Loans and receivables [Member] | Other Financial Institutions [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (19) (57)  
Loans and receivables [Member] | Other Financial Institutions [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (5) (6)  
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 117      
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 224      
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2      
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Other Financial Institutions [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 5      
Loans and receivables [Member] | Corporate Entities [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   843 968  
Loans and receivables [Member] | Corporate Entities [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   153 209  
Loans and receivables [Member] | Corporate Entities [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   170 204  
Loans and receivables [Member] | Corporate Entities [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   10,791 13,786  
Loans and receivables [Member] | Corporate Entities [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   5,192 6,383  
Loans and receivables [Member] | Corporate Entities [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (5,599) (7,402)  
Loans and receivables [Member] | Corporate Entities [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (1,939) (2,789)  
Loans and receivables [Member] | Corporate Entities [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (18,988) (18,020)  
Loans and receivables [Member] | Corporate Entities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,140      
Loans and receivables [Member] | Corporate Entities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 158      
Loans and receivables [Member] | Corporate Entities [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Corporate Entities [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,282      
Loans and receivables [Member] | Corporate Entities [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,180      
Loans and receivables [Member] | Corporate Entities [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Corporate Entities [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 149      
Loans and receivables [Member] | Corporate Entities [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 276      
Loans and receivables [Member] | Corporate Entities [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,333      
Loans and receivables [Member] | Households [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   2,512 2,343  
Loans and receivables [Member] | Households [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   603 479  
Loans and receivables [Member] | Households [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   319 426  
Loans and receivables [Member] | Households [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   8,417 8,801  
Loans and receivables [Member] | Households [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   5,395 5,483  
Loans and receivables [Member] | Households [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (3,022) (3,319)  
Loans and receivables [Member] | Households [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (2,052) (2,329)  
Loans and receivables [Member] | Households [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (10,913) (11,303)  
Loans and receivables [Member] | Households [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,835      
Loans and receivables [Member] | Households [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 64      
Loans and receivables [Member] | Households [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Households [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,971      
Loans and receivables [Member] | Households [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,047      
Loans and receivables [Member] | Households [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Loans and receivables [Member] | Households [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 254      
Loans and receivables [Member] | Households [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 618      
Loans and receivables [Member] | Households [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,404      
Total [Member] | Financial Assets Past Due But Not Impaired [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   3,432 [1] 3,384 [2]  
Total [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   759 696  
Total [Member] | Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   503 735  
Total [Member] | Gross Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   19,467 23,197  
Total [Member] | Carrying Value Financial Assets Impaired [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   10,764 12,261  
Total [Member] | Specific Allowances Individually and collectively Estimated [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (8,703) (10,937)  
Total [Member] | Collective Allowances IBNR [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (4,130) (5,270)  
Total [Member] | Accumulated Write Offs [Member] | Other [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   € (29,938) € (29,347)  
Total [Member] | Assets Without Significant Increase In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,191      
Total [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 454      
Total [Member] | Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Total [Member] | Assets Significantly Increased In Credit Risk [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,261      
Total [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3,228      
Total [Member] | Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Total [Member] | Impaired Assets [Member] | Current [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 407      
Total [Member] | Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 900      
Total [Member] | Impaired Assets [Member] | Later Than Three Months [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets € 2,774      
[1]

(*) Figures originally reported in the year 2017 in accordance to the applicable regulation, without restatements.

[2]

(*) Figures originally reported in the year 2016 in accordance to the applicable regulation, without restatements.

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