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Intangible Assets - Gross Cost, Accumulated Amortization and Impairment Losses of Intangible Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Intangible assets € 12,017 € 11,725 € 11,488
Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 40,550 37,211  
Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (28,345) (25,355)  
Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (188) (131)  
Service concession arrangements and licenses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 7,550 7,328 6,573
Service concession arrangements and licenses | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 15,837 14,456  
Service concession arrangements and licenses | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (8,123) (7,007)  
Service concession arrangements and licenses | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (164) (121)  
Software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 2,800 2,494 2,380
Software | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 17,158 15,442  
Software | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (14,344) (12,938)  
Software | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (14) (10)  
Customer base      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 721 971 1,238
Customer base | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 5,089 4,888  
Customer base | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (4,368) (3,917)  
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 263 276 512
Trademarks | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 944 901  
Trademarks | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (681) (625)  
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 39 42 51
Other intangible assets | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 870 910  
Other intangible assets | Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (829) (868)  
Other intangible assets | Impairment losses      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (2) 0  
Intangible assets in process      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 644 614 € 734
Intangible assets in process | Gross cost      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 652 614  
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 € (8) € 0