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RISK MANAGEMENT - Credit risk model scenarios - Proportion of assets in Stage 2 (Details)
Dec. 31, 2024
Dec. 31, 2023
Commercial lending portfolio [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.20% 3.60%
Commercial lending portfolio [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.20% 3.60%
Commercial lending portfolio [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.80% 3.90%
Loans to consumers [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 7.60% 6.90%
Loans to consumers [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 8.20% 7.10%
Loans to consumers [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 8.70% 7.60%
Mortgages [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 6.00% 5.60%
Mortgages [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 8.40% 5.70%
Mortgages [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 8.40% 5.70%
Microcredit [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 0.90% 5.00%
Microcredit [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 0.90% 5.00%
Microcredit [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 0.90% 5.00%