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Rights of Use - Gross Costs, Accumulated Depreciation, and Impairment Losses of Rights of Use (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € 8,448 € 8,279 € 7,579
Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 834 885 793
Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 4,287 4,130 3,561
Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 3,080 3,037 3,024
Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 247 227 € 201
Gross cost      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 17,210 15,005  
Gross cost | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 2,051 1,923  
Gross cost | Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 9,411 8,053  
Gross cost | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 5,250 4,560  
Gross cost | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 498 469  
Accumulated depreciation      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (8,762) (6,726)  
Accumulated depreciation | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (1,217) (1,038)  
Accumulated depreciation | Rights of use on buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (5,124) (3,923)  
Accumulated depreciation | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (2,170) (1,523)  
Accumulated depreciation | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € (251) € (242)