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Note 7 Residual maturities by contractual periods (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
On demand [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk € 9,227 € 39,761 € 42,518 [1]
On demand [Member] | Deposits in credit entities [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 3 2 0 [1]
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 liquidity risk 0 0 0 [1]
On demand [Member] | loans and advances [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 99 174 279 [1]
On demand [Member] | Securities portfolio settlement [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 1 10 0 [1]
On demand [Member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 0 0 0 [2]
On demand [Member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 2,176 1,936 8,838 [2]
On demand [Member] | Deposits in other financial institutions and international agencies [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 7,392 8,894 12,735 [2]
On demand [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 302,667 281,812 308,360 [2]
On demand [Member] | Security pledge funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 0 0 0 [2]
On demand [Member] | Derivatives net [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 0 (33) 0 [2]
Not later than one month [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 66,497 24,598 32,741 [1]
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 liquidity risk 3,870 3,781 3,616 [1]
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 liquidity risk 2,199 901 2,202 [1]
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 liquidity risk 31,049 33,856 20,033 [1]
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 liquidity risk 24,622 18,531 16,939 [1]
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 liquidity risk 4,031 1,779 3,896 [1]
Not later than one month [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 1,841 3,065 4,750 [2]
Not later than one month [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 7,885 4,257 7,859 [2]
Not later than one month [member] | Deposits in other financial institutions and international agencies [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 5,760 2,728 4,324 [2]
Not later than one month [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 38,951 28,806 39,978 [2]
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 liabilities liquidity risk 51,638 52,437 41,239 [2]
Not later than one month [member] | Derivatives net [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk (253) (395) (722) [2]
Later than one month and not later than three months [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 319 400 677 [1]
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 liquidity risk 1,012 801 855 [1]
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 liquidity risk 5,743 11,611 4,757 [1]
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 liquidity risk 32,009 23,185 24,280 [1]
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 liquidity risk 4,107 3,606 6,680 [1]
Later than one month and not later than three months [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 4,434 1,077 2,618 [2]
Later than one month and not later than three months [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 628 415 254 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 1,465 1,700 2,694 [2]
Later than one month and not later than three months [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 18,542 11,814 13,416 [2]
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 liabilities liquidity risk 14,543 6,858 5,301 [2]
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 liabilities liquidity risk 24 (176) 15 [2]
Later than three months and not later than six months [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 433 790 921 [1]
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 liquidity risk 746 584 797 [1]
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 liquidity risk 3,368 2,945 1,351 [1]
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 liquidity risk 25,622 22,141 23,012 [1]
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 liquidity risk 8,200 3,395 6,557 [1]
Later than three months and not later than six months [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 1,050 3,498 3,963 [2]
Later than three months and not later than six months [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 806 825 741 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 464 382 588 [2]
Later than three months and not later than six months [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 6,776 4,867 6,808 [2]
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 liabilities liquidity risk 17,736 2,485 1,643 [2]
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 liabilities liquidity risk (1,010) (326) (961) [2]
Later than six months and not later than nine months [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 434 373 356 [1]
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 liquidity risk 516 727 734 [1]
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 liquidity risk 1,432 1,063 364 [1]
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 liquidity risk 14,827 11,769 15,579 [1]
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 liquidity risk 4,305 2,333 5,084 [1]
Later than six months and not later than nine months [Member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 3,148 2,914 1,283 [2]
Later than six months and not later than nine months [Member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 56 183 152 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 379 289 353 [2]
Later than six months and not later than nine months [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 2,575 1,717 4,526 [2]
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 liabilities liquidity risk 866 1,513 1,192 [2]
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 liabilities liquidity risk (23) (66) (85) [2]
Later than nine months and not later than one year [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 468 299 461 [1]
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 liquidity risk 344 432 543 [1]
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 liquidity risk 1,127 1,692 368 [1]
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 liquidity risk 16,766 13,782 17,032 [1]
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 liquidity risk 4,746 3,958 13,014 [1]
Later than nine months and not later than one year [Member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 2,017 1,885 1,543 [2]
Later than nine months and not later than one year [Member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 694 924 726 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 758 227 272 [2]
Later than nine months and not later than one year [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 2,870 1,520 4,366 [2]
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 liabilities liquidity risk 1,503 8,252 368 [2]
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 liabilities liquidity risk 175 (641) 134 [2]
Later than one year and not later than two years [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 242 211 117 [1]
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 liquidity risk 971 694 1,251 [1]
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 liquidity risk 4,582 2,188 3,320 [1]
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 liquidity risk 41,049 39,656 46,182 [1]
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 liquidity risk 18,417 18,854 9,858 [1]
Later than one year and not later than two years [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 6,318 9,477 10,573 [2]
Later than one year and not later than two years [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 648 496 825 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 700 578 957 [2]
Later than one year and not later than two years [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 1,476 1,740 3,361 [2]
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 liabilities liquidity risk 8,136 29,954 11,304 [2]
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 liabilities liquidity risk 40 100 (400) [2]
Later than two years and not later than three years [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 183 166 120 [1]
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 liquidity risk 816 470 721 [1]
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 liquidity risk 1,354 2,239 1,849 [1]
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 liquidity risk 32,510 30,049 38,851 [1]
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 liquidity risk 8,744 13,135 15,494 [1]
Later than two years and not later than three years [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 9,423 4,931 7,505 [2]
Later than two years and not later than three years [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 211 146 189 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 293 231 337 [2]
Later than two years and not later than three years [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 1,276 578 1,213 [2]
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 liabilities liquidity risk 1,524 5,527 28,510 [2]
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 liabilities liquidity risk (153) (122) (157) [2]
Later than three years and not later than five years [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 6 8 2 [1]
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 liquidity risk 551 261 515 [1]
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 liquidity risk 2,400 1,118 891 [1]
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 liquidity risk 43,828 44,508 51,709 [1]
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 liquidity risk 23,307 17,214 17,231 [1]
Later than three years and not later than five years [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 13,282 12,332 12,793 [2]
Later than three years and not later than five years [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 396 146 166 [2]
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 instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 594 337 459 [2]
Later than three years and not later than five years [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 798 863 869 [2]
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 liabilities liquidity risk 3,493 4,755 3,740 [2]
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 liabilities liquidity risk (466) (155) (264) [2]
Later than five years [member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 0 0 0 [1]
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 liquidity risk 83 26 39 [1]
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 liquidity risk 830 469 500 [1]
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 liquidity risk 289 739 1,089 [1]
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 liquidity risk 96,201 94,780 110,173 [1]
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 liquidity risk 31,480 47,331 50,045 [1]
Later than five years [member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 18,145 19,991 23,839 [2]
Later than five years [member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 399 579 371 [2]
Later than five years [member] | Deposits in other financial institutions and international agencies [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 727 722 870 [2]
Later than five years [member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 273 416 799 [2]
Later than five years [member] | Security pledge funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 575 1,490 1,516 [2]
Later than five years [member] | Derivatives net [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk (3,717) (66) (159) [2]
Total [Member] | Cash cash balances at central banks and other demand deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 75,724 64,359 75,258 [1]
Total [Member] | Deposits in credit entities [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 6,040 6,056 6,309 [1]
Total [Member] | Deposits in other financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 7,988 5,343 8,119 [1]
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 liquidity risk 51,343 57,451 34,021 [1]
Total [Member] | loans and advances [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 327,534 298,574 344,036 [1]
Total [Member] | Securities portfolio settlement [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 107,338 111,614 127,859 [1]
Total [Member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 59,658 59,169 68,868 [2]
Total [Member] | Deposits in financial institutions [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 13,899 9,907 20,120 [2]
Total [Member] | Deposits in other financial institutions and international agencies [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 18,532 16,087 23,589 [2]
Total [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 376,203 334,132 383,694 [2]
Total [Member] | Security pledge funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 100,013 113,269 94,812 [2]
Total [Member] | Derivatives net [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk € (5,383) € (1,880) € (2,599) [2]
[1] (1) It includes the balance of the companies in the United States (see Notes 3 and 21).
[2] (1) It includes the balance of the companies in the United States (see Notes 3 and 21)