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Note 37 Interest expense breakdown by origin (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest expense by origin [Line Items]      
Interest expense on financial liabilities held for trading € 1,339 € 742 € 1,229
Interest expense on financial liabilities designated at fair value through profit or loss 52 61 6
Interest Expense For Financial Liabilities Measured At Amortised Cost 6,130 6,346 9,953
Interest Expense For Adjustment Interest On Accounting Coverage (360) (413) (250)
Interest Expense For Insurance Activity 773 721 753
Interest Expense On Chargeable Cost To Pension Funds 52 57 85
Other Interest Expense 342 284 196
Interest expense € 8,329 € 7,797 € 11,972