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Note 7 - Risk Management - Past due but not impaired and impaired secured loans risks (II) (Details) - EUR (€)
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 € 17,134,000,000 € 20,590,000,000 € 23,877,000,000 € 26,103,000,000
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   77,000,000 79,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   397,000,000 377,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   115,000,000 51,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   138,000,000 188,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   2,705,000,000 2,685,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,000,000 5,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,345,000,000 1,202,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   592,000,000 593,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,260,000,000 1,186,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,034,000,000 883,000,000  
Financial Assets Past Due But Not Impaired [Member] | Current [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   13,000,000 138,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   12,000,000 15,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   66,000,000 88,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   8,000,000 15,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   66,000,000 107,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   606,000,000 469,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   360,000,000 265,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   137,000,000 124,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   248,000,000 227,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   307,000,000 194,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than One Month And Not Later Than Two Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   11,000,000 29,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   118,000,000 124,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   9,000,000 13,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   47,000,000 59,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 82,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   317,000,000 407,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,000,000 21,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   164,000,000 254,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   43,000,000 47,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   207,000,000 269,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   107,000,000 105,000,000  
Financial Assets Past Due But Not Impaired [Member] | Later Than Two Months And Not Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   25,000,000 0  
Gross Value Financial Assets Impaired [Member] | Other [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   389,000,000 562,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   629,000,000 643,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   515,000,000 424,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   431,000,000 516,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 1,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   17,417,000,000 20,765,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   20,000,000 14,000,000  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   11,388,000,000 16,526  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   803,000,000 1,129  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,551,000,000 1,622  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   5,730,000,000 6,094  
Gross Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   1,165,000,000 253  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   151,000,000 249,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   190,000,000 114,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   179,000,000 87,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   155,000,000 252,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 0  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   10,047,000,000 11,429,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   3,000,000 2,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   7,630,000,000 9,008,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   493,000,000 656,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   457,000,000 455,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   4,444,000,000 4,546,000,000  
Carrying Value Financial Assets Impaired [Member] | Other [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   895,000,000 105,000,000  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (238,000,000) (313,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (439,000,000) (529,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (336,000,000) (337,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (276,000,000) (264,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   0 (1,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (7,370,000,000) (9,336,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (16,000,000) (12,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (3,757,000,000) (5,850,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (310,000,000) (275,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (1,093,000,000) (1,168,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   (1,286,000,000) (1,548,000,000)  
Specific Allowances Individually and collectively Estimated [Member] | Other [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets   € (271,000,000) € (147,000,000)  
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 127,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 182,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 46,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 307,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3,421,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 108,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,681,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 255,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 910,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,365,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Current [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 10,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 12,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 16,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 325,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 89,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 38,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 14,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 27,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 24,000,000      
Assets Without Significant Increase In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Without Significant Increase In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 25,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 598,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 20,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 43,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3,575,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,598,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 742,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,278,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,394,000,000      
Assets Significantly Increased In Credit Risk [Member] | Current [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 47,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 102,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 106,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 102,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,869,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,745,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 99,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 424,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,404,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 382,000,000      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Assets Significantly Increased In Credit Risk [Member] | Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Current [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 3,000,000      
Impaired Assets [Member] | Current [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 24,000,000      
Impaired Assets [Member] | Current [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,000,000      
Impaired Assets [Member] | Current [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 10,000,000      
Impaired Assets [Member] | Current [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Current [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 369,000,000      
Impaired Assets [Member] | Current [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Current [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 251,000,000      
Impaired Assets [Member] | Current [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 22,000,000      
Impaired Assets [Member] | Current [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 49,000,000      
Impaired Assets [Member] | Current [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 170,000,000      
Impaired Assets [Member] | Current [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 25,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 11,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 20,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 840,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 712,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 21,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 49,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 507,000,000      
Impaired Assets [Member] | Later Than One Month And Not Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Later Than Three Months [Member] | On demand [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 52,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Credit Card Debt [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 120,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Trade Receivables [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 50,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Finance Leases [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 110,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Repurchase Agreements [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 0      
Impaired Assets [Member] | Later Than Three Months [Member] | Other Term Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 2,433,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Advances That Are Not Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 4,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Of Which: Mortgage Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 1,365,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Of Which: Other Collateralized Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 103,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Of Which: Credit For Consumpltion [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 281,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Of Which: Lending For House Purchase [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets 839,000,000      
Impaired Assets [Member] | Later Than Three Months [Member] | Of Which: Project Finance Loans [Member]        
Disclosure Of Financial Assets That Are Either Past Due Or Impaired Line Items        
Financial Assets € 71,000,000