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Note 6 - Risk Management - Breakdown Loans and Advances Net of Impairment Losses (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
On demand and short notice [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses € 4,490  
On demand and short notice [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
On demand and short notice [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 37  
On demand and short notice [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
On demand and short notice [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 143  
On demand and short notice [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 3,504  
On demand and short notice [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 641  
On demand and short notice [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   € 0
On demand and short notice [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   222
On demand and short notice [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
On demand and short notice [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   270
On demand and short notice [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   7,663
On demand and short notice [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   2,405
On demand and short notice [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   10,560
Credit Card Debt [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 16,057  
Credit Card Debt [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Credit Card Debt [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 7  
Credit Card Debt [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1  
Credit Card Debt [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 4  
Credit Card Debt [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 2,320  
Credit Card Debt [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 12,750  
Credit Card Debt [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Credit Card Debt [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   6
Credit Card Debt [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Credit Card Debt [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   3
Credit Card Debt [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,862
Credit Card Debt [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   13,964
Credit Card Debt [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   15,835
Trade Receivables [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 15,167  
Trade Receivables [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 853  
Trade Receivables [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Trade Receivables [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 257  
Trade Receivables [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 13,704  
Trade Receivables [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 96  
Trade Receivables [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,624
Trade Receivables [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Trade Receivables [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   497
Trade Receivables [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   20,385
Trade Receivables [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   198
Trade Receivables [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   22,705
Finance Leases [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 9,160  
Finance Leases [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Finance Leases [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 209  
Finance Leases [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Finance Leases [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 3  
Finance Leases [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 8,130  
Finance Leases [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 396  
Finance Leases [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Finance Leases [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   205
Finance Leases [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Finance Leases [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   36
Finance Leases [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   8,040
Finance Leases [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   361
Finance Leases [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   8,642
Reverse Repurchase Agreements [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 946  
Reverse Repurchase Agreements [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Reverse Repurchase Agreements [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 191  
Reverse Repurchase Agreements [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 754  
Reverse Repurchase Agreements [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Reverse Repurchase Agreements [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1  
Reverse Repurchase Agreements [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Reverse Repurchase Agreements [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   305
Reverse Repurchase Agreements [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,290
Reverse Repurchase Agreements [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   13,793
Reverse Repurchase Agreements [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   10,912
Reverse Repurchase Agreements [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Reverse Repurchase Agreements [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Reverse Repurchase Agreements [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   26,300
Other Term Loans [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 351,690  
Other Term Loans [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 5,271  
Other Term Loans [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 27,278  
Other Term Loans [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 4,613  
Other Term Loans [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 6,239  
Other Term Loans [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 137,147  
Other Term Loans [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 159,531  
Other Term Loans [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   6,993
Other Term Loans [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   26,983
Other Term Loans [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   4,463
Other Term Loans [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   5,763
Other Term Loans [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   125,228
Other Term Loans [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   155,418
Other Term Loans [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   324,848
Advances That Are Not Loans [Member] | By Product [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 11,781  
Advances That Are Not Loans [Member] | By Product [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 38  
Advances That Are Not Loans [Member] | By Product [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1,515  
Advances That Are Not Loans [Member] | By Product [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 6,608  
Advances That Are Not Loans [Member] | By Product [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1,961  
Advances That Are Not Loans [Member] | By Product [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1,043  
Advances That Are Not Loans [Member] | By Product [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 544  
Advances That Are Not Loans [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   2
Advances That Are Not Loans [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,964
Advances That Are Not Loans [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   8,005
Advances That Are Not Loans [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,044
Advances That Are Not Loans [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   1,459
Advances That Are Not Loans [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   522
Advances That Are Not Loans [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   12,995
Total Member [Member] | Total [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 409,290  
Total Member [Member] | Total [Member] | Central Banks [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 5,309 7,301
Total Member [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 30,090 32,294
Total Member [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 11,976 26,261
Total Member [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 8,607 18,525
Total Member [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 165,849 164,637
Total Member [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 173,958 172,868
Total Member [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   421,886
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 149,314  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1,115  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 0  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 256  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 29,373  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 113,265  
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   998
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   0
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   308
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   37,353
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   116,938
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   155,597
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 41,632  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 7,948  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 241  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 1,024  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 24,916  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 6,660  
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | General Government [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   7,167
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | Credit Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   13,501
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | Other Financial Institutions [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   12,907
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   24,100
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   9,092
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   66,767
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | By Purpose of the Loan [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 42,333  
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | By Purpose of the Loan [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 39,863  
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   40,705
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   40,705
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | By Purpose of the Loan [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 115,930  
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | By Purpose of the Loan [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 113,687  
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | Total [Member] | Households [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   114,709
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   114,709
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | By Subordination [Member] | Gross carrying amount [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses 17,658  
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | By Subordination [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses € 17,027  
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | Total [Member] | Corporate Entities [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   16,412
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | Total [Member] | Total [Member]    
Disclosure of Loans and Advances Net Of Impairment Losses Line Items    
Loans and Advances Net Of Impairment Losses   € 16,412