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RISK MANAGEMENT - Credit risk model scenarios - Proportion of assets in Stage 2 (Details)
Dec. 31, 2023
Dec. 31, 2022
Commercial lending portfolio [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.60% 5.60%
Commercial lending portfolio [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.60% 5.90%
Commercial lending portfolio [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 3.90% 5.90%
Loans to consumers [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 6.90% 8.00%
Loans to consumers [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 7.10% 8.20%
Loans to consumers [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 7.60% 8.60%
Mortgage [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.60% 6.30%
Mortgage [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.70% 6.40%
Mortgage [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.70% 6.50%
Microcredit [member] | Scenario A    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.00% 5.20%
Microcredit [member] | Scenario B    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.00% 5.20%
Microcredit [member] | Scenario C    
Disclosure of financial assets [line items]    
Proportion of Assets in Stage 2 5.00% 5.30%