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Intangible Assets - Gross Cost, Accumulated Amortization and Impairment Losses of Intangible Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Intangible assets € 9,875 € 11,370 € 12,017
Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 38,126 40,622  
Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (27,524) (29,122)  
Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (727) (130)  
Service concession arrangements and licenses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 5,667 6,886 7,550
Service concession arrangements and licenses | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 15,018 16,056  
Service concession arrangements and licenses | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (8,666) (9,061)  
Service concession arrangements and licenses | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (685) (109)  
Software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 3,104 3,089 2,800
Software | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 18,442 17,851  
Software | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (15,300) (14,753)  
Software | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (38) (9)  
Customer base      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 151 386 721
Customer base | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 2,265 4,166  
Customer base | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (2,114) (3,780)  
Customer base | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 0 0  
Trademarks      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 187 235 263
Trademarks | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 905 958  
Trademarks | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (718) (723)  
Trademarks | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 0 0  
Other intangible assets      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 64 58 39
Other intangible assets | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 794 867  
Other intangible assets | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (726) (805)  
Other intangible assets | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (4) (4)  
Intangible assets in process      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 702 716 € 644
Intangible assets in process | Cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 702 724  
Intangible assets in process | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 0 0  
Intangible assets in process | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets € 0 € (8)