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Rights of Use - Gross Costs, Accumulated Depreciation, and Impairment Losses of Rights of Use (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € 8,279 € 7,579 € 4,982
Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 885 793 762
Buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 4,130 3,561 2,819
Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 3,037 3,024 1,238
Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 227 201 € 163
Gross cost      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 15,005 12,112  
Gross cost | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 1,923 1,491  
Gross cost | Buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 8,053 6,214  
Gross cost | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 4,560 4,003  
Gross cost | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use 469 404  
Accumulated depreciation      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (6,726) (4,533)  
Accumulated depreciation | Rights of use on land and natural properties      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (1,038) (698)  
Accumulated depreciation | Buildings      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (3,923) (2,653)  
Accumulated depreciation | Rights of use on plant and machinery      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use (1,523) (979)  
Accumulated depreciation | Other rights of use      
Disclosure of quantitative information about right-of-use assets [line items]      
Rights of use € (242) € (203)