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Tax Matters - Expected Realization of Deferred Tax Assets and Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 4,884 € 5,616 € 6,416
Deferred tax liabilities 3,067 2,602 2,620
Unused tax deductions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,884    
Unused tax deductions | Less than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 749    
Unused tax deductions | More than 1 year      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4,135    
Tax credits for loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 2,011 € 2,639 € 2,741
Deferred tax liabilities 3,067    
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 296    
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 € 2,771