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Basis of preparation and significant accounting policies - Reconciliation shareholders' equity under IFRS-EU and IFRS-IASB (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation shareholder equity eu ifrs and iasb ifrs [abstract]      
In accordance with IFRS-EU (attributable to the shareholders of the parent) € 51,240 € 49,909 € 53,919
Adjustment of the EU IAS 39 carve-out 4,902 9,357 (2,490)
Tax effect of the adjustment (1,457) (2,765) 637
Effect of adjustment after tax 3,444 6,592 (1,853)
In accordance with IFRS-IASB Shareholders’ equity € 54,684 € 56,500 € 52,066