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Income Tax Expense - Summary of Allocation of Income Tax Expense Between Current and Deferred Taxes (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Income taxes paid (refund) [abstract]      
Current taxes € (1,171) € (1,087) € (2,774)
Deferred taxes 441 592 768
Total (730) (495) (2,006)
Income before tax and investments accounted for using the equity method € 4,238 € 3,674 € 10,422