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Basis of preparation and significant accounting policies - Reconciliation net result under IFRS-EU and IFRS-IASB (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Reconciliation Net Result Eu Ifrs And Iasb Ifrs [abstract]      
In accordance with IFRS-EU (attributable to the shareholders of the parent) € 7,287 € 3,674 € 4,776
Adjustment of the EU IAS 39 carve-out (4,455) 11,856 1,603
Tax effect of the adjustment 1,308 (3,405) (429)
Effect of adjustment after tax (3,147) 8,451 1,174
Shareholders of the parent € 4,140 € 12,126 € 5,951