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Rights of Use - Gross Costs, Accumulated Depreciation, and Impairment Losses of Rights of Use (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € 7,907 € 8,448 € 8,279
Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 815 834 885
Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 3,900 4,287 4,130
Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 2,947 3,080 3,037
Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 245 247 € 227
Cost      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 18,049 17,210  
Cost | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 2,173 2,051  
Cost | Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 9,525 9,411  
Cost | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 5,837 5,250  
Cost | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 514 498  
Accumulated depreciation      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (10,142) (8,762)  
Accumulated depreciation | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (1,358) (1,217)  
Accumulated depreciation | Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (5,625) (5,124)  
Accumulated depreciation | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (2,890) (2,170)  
Accumulated depreciation | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € (269) € (251)