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Note 29 Leverage Ratio (Details) - EUR (€)
Jun. 30, 2021
 [1]
Dec. 31, 2020
Leverage ratio [Line Items]    
Level 1 Capital € 49,598,000,000 € 49,597,000,000
Leverage ratio exposure € 665,415,000,000 € 741,095,000,000
Leverage ratio 7.45% 6.69%
[1] ) Provisional data