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Intangible assets - Discount rates and terminal growth rates (Details)
Dec. 31, 2025
Banking | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 8.40%
Growth rate used to extrapolate cash flow projections 0.00%
Banking | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 15.60%
Growth rate used to extrapolate cash flow projections 2.00%
Credit card | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 10.00%
Growth rate used to extrapolate cash flow projections 1.00%
Credit card | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 15.30%
Growth rate used to extrapolate cash flow projections 2.00%
Others  
Disclosure of detailed information about intangible assets [line items]  
Growth rate used to extrapolate cash flow projections 1.00%
Others | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 9.10%
Others | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 11.20%
Life insurance [member] | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 2.78%
Life insurance [member] | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Discount rate 4.30%