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Intangible Assets - Composition and Movements in Net Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance € 11,370 € 12,017  
Additions 1,796 1,838  
Amortization (2,462) (2,583) € (2,599)
Disposals   (2)  
Impairments (506) (2)  
Transfers and others 44 50  
Transla-tion differen-ces (806) (183)  
Inflation adjustments 409 223  
Business combina-tions 22    
Ending balance 9,875 11,370 12,017
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 8    
Service concession arrangements and licenses      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 6,886 7,550  
Additions 157 183  
Amortization (757) (840)  
Disposals   0  
Impairments (485) 0  
Transfers and others 1 2  
Transla-tion differen-ces (536) (205)  
Inflation adjustments 376 196  
Business combina-tions 21 0  
Ending balance 5,667 6,886 7,550
Service concession arrangements and licenses | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 4    
Software      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 3,089 2,800  
Additions 510 486  
Amortization (1,410) (1,356)  
Disposals   (1)  
Impairments (21) 0  
Transfers and others 1,139 1,122  
Transla-tion differen-ces (222) 18  
Inflation adjustments 29 20  
Business combina-tions   0  
Ending balance 3,104 3,089 2,800
Software | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 4    
Software      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Business combina-tions (14)    
Customer base      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 386 721  
Additions 0 0  
Amortization (238) (333)  
Disposals   0  
Impairments 0 0  
Transfers and others 0 (3)  
Transla-tion differen-ces (1) 4  
Inflation adjustments (1) 0  
Business combina-tions 5    
Ending balance 151 386 721
Customer base | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 0    
Customer base      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Business combina-tions   (3)  
Trademarks      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 235 263  
Additions 0 0  
Amortization (32) (33)  
Disposals   0  
Impairments 0 0  
Transfers and others 0 0  
Transla-tion differen-ces (18) 5  
Inflation adjustments 0 0  
Business combina-tions 2 0  
Ending balance 187 235 263
Trademarks | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 0    
Other intangible assets      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 58 39  
Additions 20 20  
Amortization (25) (21)  
Disposals   0  
Impairments 0 (2)  
Transfers and others 8 5  
Transla-tion differen-ces (1) 2  
Inflation adjustments 0 0  
Business combina-tions 4 15  
Ending balance 64 58 39
Other intangible assets | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 0    
Intangible assets in process      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 716 644  
Additions 1,109 1,149  
Amortization 0 0  
Disposals   (1)  
Impairments 0 0  
Transfers and others (1,104) (1,076)  
Transla-tion differen-ces (28) (7)  
Inflation adjustments 5 7  
Business combina-tions 4 0  
Ending balance 702 716 € 644
Intangible assets in process | Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
First applica-tion of IAS 21 € 0    
Intangible assets other than goodwill, netting      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Business combina-tions   € 12