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Note 15 Derivatives Hedge accounting breakdown by type of risk and type of hedge (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging € 1,158 € 1,482 € 1,891 [1]
Derivative financial liabilities held for hedging 2,503 2,625 3,303 [1]
Of which OTC credit institutions [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 932 1,237 1,577
Derivative financial liabilities held for hedging 2,005 2,404 2,911
Of which OTC other financial corporations [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 223 237 297
Derivative financial liabilities held for hedging 499 221 391
Interest rate risk [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 257 422 656
Derivative financial liabilities held for hedging 344 364 376
Interest rate risk [member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 257 422 656
Derivative financial liabilities held for hedging 344 364 376
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 0 0 0
Derivative financial liabilities held for hedging 0 0 0
Equity risk [Member] | OTC 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] | 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 73 221 259
Derivative financial liabilities held for hedging 93 31 83
Foreign exchange and gold risk [Member] | OTC Options [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 73 221 259
Derivative financial liabilities held for hedging 93 31 83
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
Commodities 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 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 risk [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 330 644 915
Derivative financial liabilities held for hedging 437 395 459
Interest rate risk hedges cash flow [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 618 490 470
Derivative financial liabilities held for hedging 1,513 2,048 2,763
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 615 483 454
Derivative financial liabilities held for hedging 1,513 2,048 2,763
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 3 7 16
Derivative financial liabilities held for hedging 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 142 291 239
Derivative financial liabilities held for hedging 431 41 46
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 142 291 239
Derivative financial liabilities held for hedging 431 41 45
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 1 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 760 781 708
Derivative financial liabilities held for hedging 1,944 2,089 2,809
Hedges of net investment in foreign operations [member]      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets held for hedging 66 27 213
Derivative financial liabilities held for hedging 122 136 26
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 3 7
Derivative financial liabilities held for hedging 0 5 8
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 27 48
Derivative financial liabilities held for hedging € 0 € 0 € 1
[1]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).