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Intangible Assets - Composition and Movements in Net Intangible Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance € 12,017 € 11,725  
Additions 1,838 1,530  
Amortization (2,583) (2,599) € (2,388)
Disposals (2) (4)  
Impairments (2) (31)  
Transfers and others 50 204  
Translation differences and hyperinflation adjustments 40 545  
Business combinations 12 647  
Ending balance 11,370 12,017 11,725
Service concession arrangements and licenses      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 7,550 7,328  
Additions 183 173  
Amortization (840) (844)  
Disposals 0 0  
Impairments 0 (19)  
Transfers and others 2 0  
Translation differences and hyperinflation adjustments (9) 392  
Business combinations 0 520  
Ending balance 6,886 7,550 7,328
Software      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 2,800 2,494  
Additions 486 495  
Amortization (1,356) (1,337)  
Disposals (1) 0  
Impairments 0 (2)  
Transfers and others 1,122 1,011  
Translation differences and hyperinflation adjustments 38 119  
Business combinations 0 20  
Ending balance 3,089 2,800 2,494
Customer base      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 721 971  
Additions 0 0  
Amortization (333) (356)  
Disposals 0 0  
Impairments 0 0  
Transfers and others (3) 1  
Translation differences and hyperinflation adjustments 4 0  
Business combinations (3) 105  
Ending balance 386 721 971
Trademarks      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 263 276  
Additions 0 0  
Amortization (33) (34)  
Disposals 0 0  
Impairments 0 0  
Transfers and others 0 1  
Translation differences and hyperinflation adjustments 5 18  
Business combinations 0 2  
Ending balance 235 263 276
Other intangible assets      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 39 42  
Additions 20 22  
Amortization (21) (28)  
Disposals 0 (4)  
Impairments (2) (2)  
Transfers and others 5 9  
Translation differences and hyperinflation adjustments 2 0  
Business combinations 15 0  
Ending balance 58 39 42
Intangible assets in process      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning balance 644 614  
Additions 1,149 840  
Amortization 0 0  
Disposals (1) 0  
Impairments 0 (8)  
Transfers and others (1,076) (818)  
Translation differences and hyperinflation adjustments 0 16  
Business combinations 0 0  
Ending balance € 716 € 644 € 614