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Property, Plant and Equipment - Gross Cost, Accumulated Depreciation and Impairment Losses of Property, Plant and Equipment (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 22,944 € 23,714 € 22,725
Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 103,980 107,916  
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (80,675) (83,683)  
Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (361) (519)  
Land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,516 2,641 2,660
Land and buildings | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 8,689 9,097  
Land and buildings | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (6,116) (6,375)  
Land and buildings | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (57) (81)  
Plant and machinery      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 17,947 18,165 17,752
Plant and machinery | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 88,224 91,319  
Plant and machinery | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (70,001) (72,742)  
Plant and machinery | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (276) (412)  
Furniture, tools and other items      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 618 576 552
Furniture, tools and other items | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 5,190 5,157  
Furniture, tools and other items | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (4,558) (4,566)  
Furniture, tools and other items | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (14) (15)  
PP&E in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,863 2,332 € 1,761
PP&E in progress | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,877 2,343  
PP&E in progress | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 0 0  
PP&E in progress | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € (14) € (11)