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Note 37 Interest expense breakdown by origin (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Interest expense by origin [Line Items]      
Interest expense on financial liabilities held for trading € 1,140 € 1,339 € 742
Interest expense on financial liabilities designated at fair value through profit or loss 58 52 61
Interest Expense For Financial Liabilities Measured At Amortised Cost 9,985 6,130 6,346
Interest Expense For Adjustment Interest On Accounting Coverage (232) (360) (413)
Interest Expense For Insurance Activity 919 773 721
Interest Expense On Chargeable Cost To Pension Funds 76 52 57
Other Interest Expense 333 342 284
Interest expense € 12,279 € 8,329 € 7,797