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Note 7 - Risk Management -Liquidity Risk - Contractual Maturities - Managing Liquity Risk (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
On demand [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity € 42,518,000,000 € 20,954,000,000 € 9,550,000,000
On demand [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
On demand [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 279,000,000 157,000,000 132,000,000
On demand [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
On demand [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 0 1,000,000 1,000,000
On demand [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 801,000,000
Financial Obligations liquidity risk 8,838,000,000 7,377,000,000 7,107,000,000
On demand [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 1,000,000
Financial Obligations liquidity risk 12,735,000,000 10,177,000,000 10,680,000,000
On demand [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 308,360,000,000 271,638,000,000 252,630,000,000
On demand [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 0 0 40,000,000
On demand [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments 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 Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 32,741,000,000 20,654,000,000 40,599,000,000
Not Later Than One Month [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 20,033,000,000 21,612,000,000 21,266,000,000
Not Later Than One Month [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 16,939,000,000 22,015,000,000 19,825,000,000
Not Later Than One Month [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 3,896,000,000 1,622,000,000 1,875,000,000
Not Later Than One Month [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 4,750,000,000 1,393,000,000 2,678,000,000
Not Later Than One Month [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 3,616,000,000 3,591,000,000 3,211,000,000
Financial Obligations liquidity risk 7,859,000,000 7,608,000,000 5,599,000,000
Not Later Than One Month [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 2,202,000,000 1,336,000,000 1,408,000,000
Financial Obligations liquidity risk 4,324,000,000 3,859,000,000 4,327,000,000
Not Later Than One Month [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 39,978,000,000 43,577,000,000 44,866,000,000
Not Later Than One Month [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 41,239,000,000 45,135,000,000 46,489,000,000
Not Later Than One Month [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (722,000,000) (66,000,000) (75,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 4,757,000,000 3,858,000,000 1,655,000,000
Later Than One Month And Not Later Than Three Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 24,280,000,000 25,056,000,000 25,939,000,000
Later Than One Month And Not Later Than Three Months [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 6,680,000,000 3,873,000,000 4,379,000,000
Later Than One Month And Not Later Than Three Months [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 2,618,000,000 1,714,000,000 1,652,000,000
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 677,000,000 283,000,000 216,000,000
Financial Obligations liquidity risk 254,000,000 493,000,000 751,000,000
Later Than One Month And Not Later Than Three Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 855,000,000 1,120,000,000 750,000,000
Financial Obligations liquidity risk 2,694,000,000 867,000,000 1,580,000,000
Later Than One Month And Not Later Than Three Months [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 13,416,000,000 18,550,000,000 18,514,000,000
Later Than One Month And Not Later Than Three Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 5,301,000,000 3,202,000,000 2,219,000,000
Later Than One Month And Not Later Than Three Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 15,000,000 (25,000,000) (523,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,351,000,000 2,287,000,000 1,158,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 23,012,000,000 24,994,000,000 23,265,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 6,557,000,000 6,620,000,000 5,990,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 3,963,000,000 4,208,000,000 2,160,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 921,000,000 488,000,000 141,000,000
Financial Obligations liquidity risk 741,000,000 1,122,000,000 1,992,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 797,000,000 796,000,000 664,000,000
Financial Obligations liquidity risk 588,000,000 381,000,000 458,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 6,808,000,000 10,013,000,000 10,625,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,643,000,000 15,801,000,000 2,274,000,000
Later Than Three Months And Not Later Than Six Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (961,000,000) 29,000,000 (68,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 364,000,000 561,000,000 805,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 15,579,000,000 15,777,000,000 15,347,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 5,084,000,000 2,017,000,000 2,148,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,283,000,000 1,645,000,000 2,425,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 356,000,000 585,000,000 83,000,000
Financial Obligations liquidity risk 152,000,000 172,000,000 377,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 734,000,000 589,000,000 647,000,000
Financial Obligations liquidity risk 353,000,000 367,000,000 302,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 4,526,000,000 7,266,000,000 6,217,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,192,000,000 1,456,000,000 114,000,000
Later Than Six Months And Not Later Than Nine Months [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (85,000,000) (11,000,000) (5,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 368,000,000 808,000,000 498,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 17,032,000,000 16,404,000,000 16,433,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 13,014,000,000 7,292,000,000 6,823,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,543,000,000 4,386,000,000 2,736,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 461,000,000 503,000,000 152,000,000
Financial Obligations liquidity risk 726,000,000 1,514,000,000 1,240,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 543,000,000 991,000,000 375,000,000
Financial Obligations liquidity risk 272,000,000 257,000,000 309,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 4,366,000,000 6,605,000,000 7,345,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 368,000,000 653,000,000 97,000,000
Later Than Nine Months And Not Later Than One Year [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 134,000,000 1,097,000,000 (117,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 3,320,000,000 4,121,000,000 205,000,000
Later Than One Year And Not Later Than Two Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 46,182,000,000 42,165,000,000 42,100,000,000
Later Than One Year And Not Later Than Two Years [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 9,858,000,000 21,334,000,000 8,592,000,000
Later Than One Year And Not Later Than Two Years [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 10,573,000,000 8,328,000,000 7,225,000,000
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 117,000,000 189,000,000 133,000,000
Financial Obligations liquidity risk 825,000,000 386,000,000 1,149,000,000
Later Than One Year And Not Later Than Two Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,251,000,000 1,420,000,000 1,724,000,000
Financial Obligations liquidity risk 957,000,000 982,000,000 781,000,000
Later Than One Year And Not Later Than Two Years [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 3,361,000,000 3,717,000,000 5,667,000,000
Later Than One Year And Not Later Than Two Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 11,304,000,000 3,393,000,000 22,911,000,000
Later Than One Year And Not Later Than Two Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (400,000,000) (830,000,000) 498,000,000
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,849,000,000 1,838,000,000 1,352,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 38,851,000,000 35,917,000,000 32,336,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 15,494,000,000 6,115,000,000 12,423,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 7,505,000,000 10,608,000,000 8,578,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 120,000,000 24,000,000 178,000,000
Financial Obligations liquidity risk 189,000,000 614,000,000 229,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 721,000,000 1,072,000,000 896,000,000
Financial Obligations liquidity risk 337,000,000 503,000,000 304,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,213,000,000 2,062,000,000 2,137,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 28,510,000,000 7,206,000,000 526,000,000
Later Than Two Years And Not Later Than Three Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (157,000,000) (278,000,000) (91,000,000)
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 Instruments 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] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 891,000,000 411,000,000 390,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 51,709,000,000 54,772,000,000 53,386,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 17,231,000,000 13,240,000,000 11,533,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 12,793,000,000 10,803,000,000 16,040,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 2,000,000 120,000,000 27,000,000
Financial Obligations liquidity risk 166,000,000 206,000,000 196,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 515,000,000 672,000,000 1,286,000,000
Financial Obligations liquidity risk 459,000,000 499,000,000 825,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 869,000,000 854,000,000 1,207,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 3,740,000,000 759,000,000 218,000,000
Later Than Three Years And Not Later Than Five Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (264,000,000) (333,000,000) (67,000,000)
Later Than Five Years [Member] | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 0 0 0
Later Than Five Years [Member] | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 1,089,000,000 803,000,000 210,000,000
Later Than Five Years [Member] | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 110,173,000,000 122,098,000,000 120,571,000,000
Later Than Five Years [Member] | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 50,045,000,000 46,022,000,000 42,738,000,000
Later Than Five Years [Member] | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 23,839,000,000 27,840,000,000 26,363,000,000
Later Than Five Years [Member] | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 39,000,000 432,000,000 1,269,000,000
Financial Obligations liquidity risk 371,000,000 510,000,000 904,000,000
Later Than Five Years [Member] | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 500,000,000 2,089,000,000 2,764,000,000
Financial Obligations liquidity risk 870,000,000 952,000,000 1,692,000,000
Later Than Five Years [Member] | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 799,000,000 1,039,000,000 1,310,000,000
Later Than Five Years [Member] | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 1,516,000,000 1,308,000,000 1,627,000,000
Later Than Five Years [Member] | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk (159,000,000) (420,000,000) (392,000,000)
Total Member | Cash And Balances With Central Banks And Other Demand Deposits [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 75,258,000,000 41,608,000,000 50,149,000,000
Total Member | Reverse Repo Securities Borrowing and Margin Lending [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 34,021,000,000 36,299,000,000 27,539,000,000
Total Member | Loans and advances [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 344,036,000,000 359,354,000,000 349,334,000,000
Total Member | Securities Portfolio Settlement [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 127,859,000,000 108,136,000,000 96,501,000,000
Total Member | Deposits Certificates [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 68,868,000,000 70,927,000,000 69,858,000,000
Total Member | Deposits in Credit Entities [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 6,309,000,000 6,216,000,000 6,211,000,000
Financial Obligations liquidity risk 20,120,000,000 20,004,000,000 19,544,000,000
Total Member | Deposits in Other Financial Institutions [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial assets for liquidity 8,119,000,000 10,084,000,000 10,515,000,000
Financial Obligations liquidity risk 23,589,000,000 18,843,000,000 21,258,000,000
Total Member | Rest Of The Customers Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 383,694,000,000 365,321,000,000 350,518,000,000
Total Member | Security Pledge Funding [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk 94,812,000,000 78,914,000,000 76,515,000,000
Total Member | Derivatives Net [Member]      
Disclosure Of Maturity Analysis For Financial Instruments Held For Managing Liquidity Risk Line Items      
Financial Obligations liquidity risk € (2,599,000,000) € (838,000,000) € (840,000,000)