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Note 7 - Risk Management - Breakdown Loans and Advances Net of Impairment Losses (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 10    
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 151    
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 2,833    
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 648    
On demand and short notice [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (193)    
On demand and short notice [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 3,641    
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 3,834    
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 € 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   222 373
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 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   270 246
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 8,125
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 2,507
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 11,251
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 8    
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 2    
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 2,328    
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 13,108    
Credit Card Debt [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (1,048)    
Credit Card Debt [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 15,446    
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 16,495    
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 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 1
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 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 1
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 1,875
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 14,719
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 16,596
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 948    
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 195    
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 16,190    
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 103    
Trade Receivables [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (280)    
Trade Receivables [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 17,436    
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 17,716    
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 2,091
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 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   497 998
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 20,246
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   198 418
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 23,753
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 226    
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 8,014    
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 406    
Finance Leases [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (427)    
Finance Leases [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 8,650    
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 9,077    
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 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   205 261
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 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 57
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 8,647
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   361 477
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 9,442
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 293    
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 477    
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 0    
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] | By Product [Member] | Provisions [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] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 770    
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 772    
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 81
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   1,290 544
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 15,597
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 6,746
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 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 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 22,968
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 3,911    
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 26,839    
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 2,947    
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 7,030    
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 133,573    
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 157,760    
Other Term Loans [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (10,204)    
Other Term Loans [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 332,060    
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 342,264    
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 8,814
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 29,140
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 7,694
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 6,878
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   125,228 136,105
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   155,418 167,892
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   324,848 356,524
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 29    
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 1,592    
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 5,771    
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 2,088    
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 984    
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 498    
Advances That Are Not Loans [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (63)    
Advances That Are Not Loans [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 10,962    
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 11,025    
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 0
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 2,410
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 8,083
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 2,082
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 1,194
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   522 620
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 14,389
Total Member [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 3,941    
Total Member [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 29,917    
Total Member [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 9,196    
Total Member [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 9,468    
Total Member [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 163,922    
Total Member [Member] | By Product [Member] | Households [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 172,522    
Total Member [Member] | By Product [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (12,217)    
Total Member [Member] | By Product [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 388,966    
Total Member [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 401,183    
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   7,301 8,894
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   32,294 34,820
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   26,261 31,373
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   18,525 17,009
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   164,637 176,192
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   172,868 186,633
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   421,886 454,921
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 1,056    
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 15    
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 219    
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 26,784    
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 111,809    
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (4,122)    
Loans and Advances Net Of Impairment Losses Of Which: Mortgage Loans [Member] | By Secured Loans [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 139,883    
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 144,005    
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 4,722
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   0 112
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   308 690
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 44,406
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   116,938 132,398
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   155,597 182,328
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Central Banks [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: 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 7,179    
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 285    
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 1,389    
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 31,393    
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 6,835    
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (774)    
Loans and Advances Net Of Impairment Losses Of Which: Other Collateralized Loans [Member] | By Secured Loans [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 47,081    
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 47,855    
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 3,700
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 15,191
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 8,164
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 21,863
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 6,061
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 54,979
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 40,124    
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | By Purpose of the Loan [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (2,613)    
Loans and Advances Net Of Impairment Losses Of Which: Credit For Consumpltion [Member] | By Purpose of the Loan [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 40,124    
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 42,736    
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 44,504
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 44,504
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 111,007    
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | By Purpose of the Loan [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (1,945)    
Loans and Advances Net Of Impairment Losses Of Which: Lending For House Purchase [Member] | By Purpose of the Loan [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 111,007    
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 112,952    
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   114,709 127,606
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   114,709 127,606
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | By Subordination [Member] | Provisions [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses (312)    
Loans and Advances Net Of Impairment Losses Of Which: Project Finance Loans [Member] | By Subordination [Member] | Total [Member]      
Disclosure of Loans and Advances Net Of Impairment Losses Line Items      
Loans and Advances Net Of Impairment Losses 13,973    
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 € 14,286    
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 19,269
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 € 19,269