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Intangible Assets - Composition and Movements in Net Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance € 11,725 € 11,488  
Additions 1,530 2,410  
Amortization (2,599) (2,388) € (2,735)
Disposals (4) (229)  
Impairments (31)    
Transfers and others 204 215  
Translation differences and hyperinflation adjustments 545 121  
Business combinations 647 108  
Ending balance 12,017 11,725 11,488
Total additions including additions corresponding to companies held for sale and sold companies   2,981  
Service concession arrangements and licenses      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 7,328 6,573  
Additions 173 1,188  
Amortization (844) (725)  
Disposals 0 (3)  
Impairments (19)    
Transfers and others 0 197  
Translation differences and hyperinflation adjustments 392 98  
Business combinations 520 0  
Ending balance 7,550 7,328 6,573
Software      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 2,494 2,380  
Additions 495 513  
Amortization (1,337) (1,226)  
Disposals 0 (8)  
Impairments (2)    
Transfers and others 1,011 828  
Translation differences and hyperinflation adjustments 119 6  
Business combinations 20 1  
Ending balance 2,800 2,494 2,380
Customer base      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 971 1,238  
Additions 0 0  
Amortization (356) (376)  
Disposals 0 0  
Impairments 0    
Transfers and others 1 0  
Translation differences and hyperinflation adjustments 0 2  
Business combinations 105 107  
Ending balance 721 971 1,238
Trademarks      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 276 512  
Additions 0 2  
Amortization (34) (39)  
Disposals 0 (210)  
Impairments 0    
Transfers and others 1 0  
Translation differences and hyperinflation adjustments 18 11  
Business combinations 2 0  
Ending balance 263 276 512
Other intangible assets      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 42 51  
Additions 22 17  
Amortization (28) (22)  
Disposals (4) 0  
Impairments (2)    
Transfers and others 9 (3)  
Translation differences and hyperinflation adjustments 0 (1)  
Business combinations 0 0  
Ending balance 39 42 51
Intangible assets in process      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 614 734  
Additions 840 690  
Amortization 0 0  
Disposals 0 (8)  
Impairments (8)    
Transfers and others (818) (807)  
Translation differences and hyperinflation adjustments 16 5  
Business combinations 0 0  
Ending balance € 644 € 614 € 734