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Note 7 - Risk Management -Liquidity Risk - Contractual Maturities - Managing Liquity Risk (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
On demand [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity € 9,550 € 8,179 € 23,191
On demand [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 801 252 991
On demand [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1 1 1
On demand [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 18,979 0
On demand [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 132 267 591
On demand [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 1 0
On demand [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1 0 419
On demand [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 7,107 6,831 6,762
On demand [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 10,680 10,700 15,375
On demand [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 252,630 233,068 206,140
On demand [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 40 0 0
On demand [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 0 0 0
Not Later Than One Month [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 40,599 31,029 13,825
Not Later Than One Month [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 3,211 4,391 4,068
Not Later Than One Month [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,408 939 1,192
Not Later Than One Month [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 21,266 2,689 20,232
Not Later Than One Month [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 19,825 21,203 20,272
Not Later Than One Month [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,875 1,579 708
Not Later Than One Month [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,678 3,648 7,380
Not Later Than One Month [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 5,599 5,863 5,365
Not Later Than One Month [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 4,327 4,827 6,542
Not Later Than One Month [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 44,866 45,171 49,053
Not Later Than One Month [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 46,489 35,502 38,153
Not Later Than One Month [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (75) (18) (2,123)
Later Than One Month And Not Later Than Three Months [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 216 181 254
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 750 758 967
Later Than One Month And Not Later Than Three Months [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,655 1,921 544
Later Than One Month And Not Later Than Three Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 25,939 26,323 25,990
Later Than One Month And Not Later Than Three Months [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 4,379 4,159 3,566
Later Than One Month And Not Later Than Three Months [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,652 4,209 2,943
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 751 1,082 1,181
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,580 3,290 8,624
Later Than One Month And Not Later Than Three Months [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 18,514 18,616 25,522
Later Than One Month And Not Later Than Three Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,219 2,284 3,561
Later Than One Month And Not Later Than Three Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (523) (110) (95)
Later Than Three Months And Not Later Than Six Months [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 141 169 155
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 664 796 675
Later Than Three Months And Not Later Than Six Months [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,158 541 523
Later Than Three Months And Not Later Than Six Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 23,265 23,606 22,318
Later Than Three Months And Not Later Than Six Months [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 5,990 4,423 3,688
Later Than Three Months And Not Later Than Six Months [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,160 4,238 5,547
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,992 2,335 2,104
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 458 1,959 3,382
Later Than Three Months And Not Later Than Six Months [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 10,625 11,428 15,736
Later Than Three Months And Not Later Than Six Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,274 1,405 1,403
Later Than Three Months And Not Later Than Six Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (68) (116) (190)
Later Than Six Months And Not Later Than Nine Months [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 83 120 48
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 647 628 714
Later Than Six Months And Not Later Than Nine Months [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 805 426 0
Later Than Six Months And Not Later Than Nine Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 15,347 15,380 16,212
Later Than Six Months And Not Later Than Nine Months [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 2,148 2,380 2,301
Later Than Six Months And Not Later Than Nine Months [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,425 1,227 3,463
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 377 392 800
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 302 554 2,566
Later Than Six Months And Not Later Than Nine Months [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 6,217 8,711 11,863
Later Than Six Months And Not Later Than Nine Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 114 396 1,004
Later Than Six Months And Not Later Than Nine Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (5) (135) (111)
Later Than Nine Months And Not Later Than One Year [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 152 122 72
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 375 447 532
Later Than Nine Months And Not Later Than One Year [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 498 815 428
Later Than Nine Months And Not Later Than One Year [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 16,433 17,516 15,613
Later Than Nine Months And Not Later Than One Year [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 6,823 13,391 4,312
Later Than Nine Months And Not Later Than One Year [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,736 2,456 5,967
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,240 1,714 2,176
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 309 1,328 1,897
Later Than Nine Months And Not Later Than One Year [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 7,345 10,368 11,343
Later Than Nine Months And Not Later Than One Year [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 97 973 912
Later Than Nine Months And Not Later Than One Year [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (117) (117) (326)
Later Than One Year And Not Later Than Two Years [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 133 116 117
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,724 1,029 1,330
Later Than One Year And Not Later Than Two Years [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 205 30 500
Later Than One Year And Not Later Than Two Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 42,100 43,973 44,956
Later Than One Year And Not Later Than Two Years [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 8,592 5,789 19,320
Later Than One Year And Not Later Than Two Years [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 7,225 5,772 7,825
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,149 930 746
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 781 963 1,340
Later Than One Year And Not Later Than Two Years [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 5,667 7,607 8,619
Later Than One Year And Not Later Than Two Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 22,911 64 1,281
Later Than One Year And Not Later Than Two Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 498 (336) (132)
Later Than Two Years And Not Later Than Three Years [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 178 112 87
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 896 681 918
Later Than Two Years And Not Later Than Three Years [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,352 727 286
Later Than Two Years And Not Later Than Three Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 32,336 35,383 35,093
Later Than Two Years And Not Later Than Three Years [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 12,423 11,289 10,010
Later Than Two Years And Not Later Than Three Years [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 8,578 6,432 5,963
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 229 765 1,156
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 304 286 686
Later Than Two Years And Not Later Than Three Years [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,137 2,612 5,060
Later Than Two Years And Not Later Than Three Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 526 23,009 640
Later Than Two Years And Not Later Than Three Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (91) (91) (82)
Later Than Three Years And Not Later Than Five Years [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 27 157 122
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,286 806 942
Later Than Three Years And Not Later Than Five Years [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 390 226 124
Later Than Three Years And Not Later Than Five Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 53,386 50,809 55,561
Later Than Three Years And Not Later Than Five Years [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 11,533 12,070 16,662
Later Than Three Years And Not Later Than Five Years [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 16,040 18,391 14,016
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 196 171 859
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 825 355 875
Later Than Three Years And Not Later Than Five Years [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,207 1,833 781
Later Than Three Years And Not Later Than Five Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 218 338 23,959
Later Than Three Years And Not Later Than Five Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (67) (106) (105)
Later Than Five Years [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Five Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,269 1,868 4,087
Later Than Five Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 2,764 1,975 336
Later Than Five Years [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 210 0 189
Later Than Five Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 120,571 123,568 133,589
Later Than Five Years [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 42,738 44,666 51,472
Later Than Five Years [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 26,363 30,162 31,875
Later Than Five Years [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 904 1,429 3,714
Later Than Five Years [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,692 1,045 2,825
Later Than Five Years [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,310 2,034 936
Later Than Five Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,627 1,697 1,712
Later Than Five Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (392) (419) (47)
Total [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 50,149 39,208 37,016
Total [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 6,211 7,488 10,002
Total [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 10,515 8,060 7,608
Total [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 27,539 26,354 22,826
Total [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 349,334 358,028 370,195
Total [Member] | Securities Portfolio Segttlement [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 96,501 99,747 112,039
Total [Member] | Whosale Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 69,858 76,535 85,397
Total [Member] | Deposits in Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 19,544 21,512 24,862
Total [Member] | Deposits in Other Financial Institutions and International Agencies [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 21,258 25,307 44,114
Total [Member] | Customer Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 350,518 341,448 335,052
Total [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 76,515 65,668 72,626
Total [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk € (840) € (1,448) € (3,210)