Note 8 Fair value of financial assets by levels, valuation techniques and inputs (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Observable inputs | - Exchange rates- Market quoted future prices- Market interest rates- Underlying assets prices: shares, funds, commodities- Market observable volatilities - Issuer credit spread levels- Quoted dividends- Market listed correlations |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Equity investments [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Comparable pricing (Observable price in a similar market)Net asset value |
| Observable inputs | - Brokers quotes- Market operations- NAVs published |
| Unobservable inputs | - NAV provided by the administrator of the fund |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Debt securities [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Present-value method(Discounted future cash flows)Observed prices in non-active markets |
| Observable inputs | - Issuer´s credit risk- Current market interest rates- Non active markets prices |
| Unobservable inputs | - Prepayment rates- Issuer´s credit risk- Recovery rates |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | loans and advances [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Present-value method(Discounted future cash flows) |
| Observable inputs | - Issuer´s credit risk- Current market interest rates- Funding interest rates observed in the market or in consensus services- Exchange rates |
| Unobservable inputs | - Prepayment rates- Issuer´s credit risk- Recovery rates- Funding interest rates not observed in the market or in consensus services |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Interest rate, measurement input [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Interest rate products (Interest rate Swaps, Call money Swaps and FRA): Discounted cash flowsCaps/Floors: Black 76 and SABRBond options: Black 76Swaptions: Black, SABR and LGMOther Interest rate Options: Black, SABR, Libor Market Model and QGM.Constant Maturity Swaps: SABR |
| Unobservable inputs | - Beta- Implicit correlations between tenors- interest rates volatility |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Components of equity [domain] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Future and Equity Forward: Discounted future cash flowsEquity Options: Local Volatility, Momentum adjustment and Heston |
| Unobservable inputs | - Volatility of volatility- Implicit assets correlations- Long term implicit correlations- Implicit dividends and long term repos |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Foreign exchange and gold [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Future and Equity Forward: Discounted future cash flowsForeign exchange Options: Local volatility, momentum adjustment |
| Unobservable inputs | - Volatility of volatility- Implicit assets correlations- Long term implicit correlations |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Derivatives [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Credit Derivatives: Default model and Gaussian copula |
| Unobservable inputs | - Correlation default- Credit spread- Recovery rates- Interest rate yield- Default volatility |
| Financial assets at fair value through profit or loss, classified as held for trading, category [member] | Commodities [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Commodities: Momentum adjustment and discounted cash flows |
| Non trading financial assets mandatorily at fair value through profit or loss [Member] | Equity investments [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Comparable pricing (Observable price in a similar market)Net asset value |
| Observable inputs | - Brokers quotes- Market operations- NAVs published |
| Unobservable inputs | - NAV provided by the administrator of the fund |
| Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Present-value method(Discounted future cash flows) |
| Observable inputs | - Issuer credit risk- Current market interest rates |
| Unobservable inputs | - Prepayment rates- Issuer credit risk- Recovery rates |
| Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Discounted future cash flows |
| Unobservable inputs | - Prepayment rates- Interest rates |
| Financial assets at fair value through profit or loss, category [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Present-value method(Discounted future cash flows) |
| Observable inputs | - Issuer credit risk- Current market interest rates |
| Financial assets at fair value through other comprehensive income, category [member] | Equity investments [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Comparable pricing (Observable price in a similar market)Net asset value |
| Observable inputs | - Brokers quotes- Market operations- NAVs published |
| Unobservable inputs | - NAV provided by the administrator of the fund |
| Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Present-value method(Discounted future cash flows)Observed prices in non-active markets |
| Observable inputs | - Issuer´s credit risk- Current market interest rates- Non active market prices |
| Unobservable inputs | - Prepayment rates- Issuer credit risk- Recovery rates |
| Hedging derivatives [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Observable inputs | - Exchange rates- Market quoted future prices- Market interest rates- Underlying assets prices: shares, funds, commodities- Market observable volatilities - Issuer credit spread levels- Quoted dividends- Market listed correlations |
| Hedging derivatives [Member] | Interest rate, measurement input [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Interest rate products (Interest rate Swaps, Call money Swaps and FRA): Discounted cash flowsCaps/Floors: Black 76 and SABRBond options: Black 76Swaptions: Black, SABR and LGMOther Interest rate Options: Black, SABR and Libor Market ModelConstant Maturity Swaps: SABR |
| Unobservable inputs | - Beta- Implicit correlations between tenors- interest rates volatility |
| Hedging derivatives [Member] | Components of equity [domain] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Future and Equity Forward: Discounted future cash flowsEquity Options: Local volatility, Black 76, Momentum adjustment and Heston |
| Unobservable inputs | - Volatility of volatility- Implicit assets correlations- Long term implicit correlations- Implicit dividends and long term repos |
| Hedging derivatives [Member] | Foreign exchange and gold [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Future and Equity Forward: Discounted future cash flowsForeign exchange Options: Local volatility, momentum adjustment |
| Unobservable inputs | - Volatility of volatility- Implicit assets correlations- Long term implicit correlations |
| Hedging derivatives [Member] | Derivatives [member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Credit Derivatives: Default model and Gaussian copula |
| Unobservable inputs | - Correlation default- Credit spread- Recovery rates- Interest rate yield- Default volatility |
| Hedging derivatives [Member] | Commodities [Member] | |
| Financial assets at fair value by levels [Line Items] | |
| Valuation techniques | Commodities: Momentum adjustment and Discounted cash flows |
| Unobservable inputs |