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Note 32 Interest expense breakdown by origin (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Interest expense by origin [Line Items]    
Interest expense on financial liabilities held for trading € 651,000,000 € 344,000,000
Interest expense on financial liabilities designated at fair value through profit or loss 33,000,000 33,000,000
Interest Expense For Financial Liabilities Measured At Amortised Cost 2,980,000,000 3,587,000,000
Interest Expense For Adjustment Interest On Accounting Coverage (200,000,000) (167,000,000)
Interest Expense For Insurance Activity 362,000,000 324,000,000
Interest Expense On Chargeable Cost To Pension Funds 30,000,000 32,000,000
Other Interest Expense 150,000,000 114,000,000
Interest expense € 4,007,000,000 € 4,267,000,000