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Note 6 Maximum credit risk exposure breakdown by counterparty and product (Details) - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product € 3,731 € 3,161
Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 16,102 14,030
Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 20,984 19,524
Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 8,315 7,911
Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2,977 4,004
Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 302,636 276,739
Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 15,392 13,208
Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 370,138 338,577
Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 121,060 116,897
Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 15,968 10,979
Of which credit for consumption [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 47,635 42,294
Of which lending for house purchase [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 96,780 95,209
Of which project finance loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 9,599 8,863
Central banks [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
Central banks [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
Central banks [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
Central banks [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 890 1,192
Central banks [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 5,447 4,174
Central banks [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 412 315
Central banks [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 6,748 5,681
Central banks [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 692 1,180
General government [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 6 6
General government [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 1 0
General government [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 670 791
General government [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 192 191
General government [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
General government [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 20,025 18,440
General government [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 372 394
General government [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 21,266 19,822
General government [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 312 324
General government [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 4,940 1,413
credit institutions [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
credit institutions [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
credit institutions [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 26 0
credit institutions [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
credit institutions [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2,086 2,788
credit institutions [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 3,672 4,004
credit institutions [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 7,257 6,510
credit institutions [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 13,041 13,303
credit institutions [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
credit institutions [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 1,757 2,534
Other financial corporations [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 249 321
Other financial corporations [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2 1
Other financial corporations [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 617 476
Other financial corporations [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 14 14
Other financial corporations [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2 23
Other financial corporations [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 6,648 5,413
Other financial corporations [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 4,854 3,554
Other financial corporations [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 12,386 9,804
Other financial corporations [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 245 220
Other financial corporations [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 435 390
Non financial corporations [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2,837 2,339
Non financial corporations [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 1,722 1,504
Non financial corporations [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 19,597 18,191
Non financial corporations [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 7,775 7,388
Non financial corporations [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
Non financial corporations [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 125,046 110,204
Non financial corporations [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 1,764 1,805
Non financial corporations [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 158,741 141,431
Non financial corporations [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 23,976 21,531
Non financial corporations [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 6,041 3,512
Non financial corporations [Member] | Of which project finance loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 9,599 8,863
Households [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 639 495
Households [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 14,377 12,523
Households [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 75 66
Households [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 335 317
Households [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 0 0
Households [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 141,799 134,505
Households [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 732 630
Households [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 157,957 148,536
Households [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 96,526 94,821
Households [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2,103 1,950
Households [Member] | Of which credit for consumption [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 47,635 42,294
Households [Member] | Of which lending for house purchase [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 96,780 95,209
Gross Carrying Amount [Member] | On demand [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 3,920 3,345
Gross Carrying Amount [Member] | Credit card debt [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 17,177 14,949
Gross Carrying Amount [Member] | Commercial debtors [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 21,235 19,766
Gross Carrying Amount [Member] | Finance leases [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 8,637 8,256
Gross Carrying Amount [Member] | Reverse repurchase loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 2,981 4,013
Gross Carrying Amount [Member] | Other term loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 312,463 286,127
Gross Carrying Amount [Member] | Advances that are not loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 15,450 13,263
Gross Carrying Amount [Member] | Total loans and advances by products [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 381,862 349,719
Gross Carrying Amount [Member] | Of which mortagage loans collateralized by immovable property [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 124,210 119,980
Gross Carrying Amount [Member] | Of which other collateralized loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 16,328 11,335
Gross Carrying Amount [Member] | Of which credit for consumption [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 50,915 45,236
Gross Carrying Amount [Member] | Of which lending for house purchase [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product 98,336 96,612
Gross Carrying Amount [Member] | Of which project finance loans [Member]    
Breakdown by counterparty and product [Line Items]    
Loans and advances by counterparty and product € 10,130 € 9,423