v3.25.4
Note 7 Residual maturities by contractual periods (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
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 € 14,413 € 11,125 € 10,353
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
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 0 0 0
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 2,061 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 liquidity risk 0 0 0
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 0 0 0
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
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 3,151 2,600 2,092
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 8,003 6,950 8,507
On demand [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 345,742 318,252 304,096
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 1,299 0 0
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 0 0
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 43,789 38,087 61,678
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 5,953 5,246 4,676
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 4,505 2,677 1,288
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 51,418 34,310 42,407
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 40,574 34,605 28,644
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 4,598 2,861 2,167
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 5,139 2,484 1,187
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 4,504 6,070 3,669
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 12,649 9,247 5,526
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 67,090 50,789 44,745
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 89,726 74,614 86,908
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 58 (388) (21)
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
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 868 541 393
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 1,626 1,642 1,261
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 9,957 10,594 21,683
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 40,625 38,547 30,850
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 3,947 2,741 6,011
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 4,481 4,816 3,889
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 1,394 476 1,076
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 4,606 2,466 2,806
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 25,358 23,758 16,225
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 14,794 14,093 30,028
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 103 (73) (30)
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
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 1,056 1,165 543
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 1,315 970 1,049
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 4,566 5,025 6,890
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 30,638 29,770 28,239
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 9,016 6,084 2,633
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 7,210 5,536 8,518
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 775 644 715
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 1,684 1,584 1,036
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 13,345 11,580 11,855
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 5,108 5,452 6,107
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 167 (142) 6
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
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 962 647 594
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 846 929 385
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 1,707 1,911 3,398
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 19,096 16,928 16,434
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 4,451 2,531 2,578
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 4,872 3,347 4,935
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 622 130 119
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 823 922 834
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 5,668 3,888 3,905
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 1,407 2,355 2,274
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 465 70 (62)
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
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 1,430 918 602
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 726 1,130 649
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 2,320 3,138 2,596
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 22,144 19,715 19,029
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 8,405 5,922 11,950
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 7,653 3,685 4,225
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 765 732 605
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 1,065 503 841
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 6,638 4,329 5,500
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 2,047 4,157 1,821
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 (87) 142 (267)
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
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 670 861 602
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 2,941 1,577 2,019
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 7,223 5,782 3,319
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 49,496 44,537 41,267
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 18,718 20,625 15,266
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 13,261 8,517 10,296
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 936 558 795
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 1,798 1,256 1,033
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 2,056 2,055 1,753
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 3,656 2,223 2,630
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 145 549 69
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
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 1,186 351 136
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 2,654 1,526 965
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 1,933 3,675 3,817
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 41,730 34,618 32,769
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 8,361 20,053 14,016
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 4,252 11,386 7,990
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 321 242 46
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 302 477 618
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 1,176 569 1,029
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 507 366 1,111
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 104 (122) 45
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
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 112 33 24
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 2,059 1,369 974
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 669 3,008 2,133
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 58,930 51,469 45,116
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 29,414 21,972 29,245
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 9,584 7,530 11,175
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 601 570 198
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 361 433 695
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 1,062 834 758
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 288 1,454 2,060
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 (79) 5 (135)
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
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 66 41 102
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 2,060 681 1,291
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 113 122 139
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 114,633 105,649 104,086
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 47,407 44,850 34,558
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 32,528 28,306 22,424
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 550 743 695
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 550 742 638
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 465 787 1,092
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 564 445 677
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 (807) (87) (2,616)
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 58,202 49,212 72,031
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 12,303 9,805 7,672
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 18,732 12,502 9,882
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 81,967 67,565 86,382
Total [Member] | loans and advances [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 417,866 375,837 346,433
Total [Member] | Securities portfolio settlement [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial assets liquidity risk 134,317 127,640 118,424
Total [Member] | Wholesale funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 88,980 75,608 74,639
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 13,619 12,765 10,011
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 31,841 24,581 22,535
Total [Member] | Customer deposits [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 468,600 416,841 390,959
Total [Member] | Security pledge funding [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk 119,396 105,159 133,615
Total [Member] | Derivatives net [Member]      
Disclosure of maturity analysis for financial instruments held for managing liquidity risk [Line Items]      
Financial liabilities liquidity risk € 69 € (46) € (3,009)