v3.25.4
Note 15 Derivatives Hedge accounting breakdown by type of risk and type of hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging € 570 € 1,158 € 1,482
Derivative financial liabilities held for hedging 1,933 2,503 2,625
Of which OTC credit institutions [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 538 932 1,237
Derivative financial liabilities held for hedging 1,554 2,005 2,404
Of which OTC other financial corporations [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 24 223 237
Derivative financial liabilities held for hedging 343 499 221
Interest rate risk [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 329 257 422
Derivative financial liabilities held for hedging 162 344 364
Interest rate risk [member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 329 257 422
Derivative financial liabilities held for hedging 162 344 364
Interest rate risk [member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Equity risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 18 0 0
Derivative financial liabilities held for hedging 1 0 0
Equity risk [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 18 0 0
Derivative financial liabilities held for hedging 1 0 0
Equity risk [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Foreign exchange and gold risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 8 73 221
Derivative financial liabilities held for hedging 139 93 31
Foreign exchange and gold risk [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 8 73 221
Derivative financial liabilities held for hedging 139 93 31
Foreign exchange and gold risk [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Credit risk [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Commodity price risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Other price risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Fair value hedges [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 355 330 644
Derivative financial liabilities held for hedging 302 437 395
Interest rate risk hedges cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 91 618 490
Derivative financial liabilities held for hedging 1,215 1,513 2,048
Interest rate risk hedges cash flow [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 91 615 483
Derivative financial liabilities held for hedging 1,212 1,513 2,048
Interest rate risk hedges cash flow [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 3 7
Derivative financial liabilities held for hedging 3 0 0
Equity instruments risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Foreign exchange and gold risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 115 142 291
Derivative financial liabilities held for hedging 216 431 41
Foreign exchange and gold risk hedge cash flow [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 115 142 291
Derivative financial liabilities held for hedging 216 431 41
Foreign exchange and gold risk hedge cash flow [Member] | Organized market options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 1
Credit risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Commodities risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Other risk hedge cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Cash flow hedges [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 206 760 781
Derivative financial liabilities held for hedging 1,431 1,944 2,089
Hedges of net investment in foreign operations [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 7 66 27
Derivative financial liabilities held for hedging 200 122 136
Portfolio fair value hedges of interest rate risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 2 2 3
Derivative financial liabilities held for hedging 0 0 5
Portfolio cash flow hedges of interest rate risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 0 0 27
Derivative financial liabilities held for hedging € 0 € 0 € 0