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Tax Matters - Expected Realization of Deferred Tax Assets and Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 6,673 € 6,240 € 4,884
Deferred tax liabilities 2,905 2,702 3,067
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 6,673    
Unused tax deductions | Less than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1,034    
Unused tax deductions | More than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5,639    
Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,877 € 2,803 € 2,011
Deferred tax liabilities 2,905    
Tax credits for loss carryforwards | Less than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 295    
Tax credits for loss carryforwards | More than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities € 2,610