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Note 6 Operations With Moratorium Given By The Group (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Operations With Moratorium Given By The Group [Line Items]    
Total operations with moratoriums and guarantees € 41,539,000,000 € 44,458,000,000
Loan investment percentage 12.00% 12.90%
Current [Member]    
Operations With Moratorium Given By The Group [Line Items]    
Operations with moratoirum € 2,778,000,000 € 6,536,000,000
Finished [Member]    
Operations With Moratorium Given By The Group [Line Items]    
Operations with moratoirum 22,669,000,000 21,868,000,000
Total [Member]    
Operations With Moratorium Given By The Group [Line Items]    
Operations with moratoirum 25,447,000,000 28,405,000,000
Operations financing with public guarantee 16,093,000,000 16,053,000,000
Number of clients [Member]    
Operations With Moratorium Given By The Group [Line Items]    
Operations with moratoirum 2,651,810,000,000 2,779,964,000,000
Operations financing with public guarantee € 259,773,000,000 € 249,458,000,000