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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 23,714 € 22,725 € 23,769
Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 107,916 101,874  
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (83,683) (78,751)  
Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (519) (398)  
Land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,641 2,660 2,829
Land and buildings | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 9,097 8,624  
Land and buildings | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (6,375) (5,905)  
Land and buildings | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (81) (59)  
Plant and machinery      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 18,165 17,752 18,676
Plant and machinery | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 91,319 86,779  
Plant and machinery | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (72,742) (68,713)  
Plant and machinery | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (412) (314)  
Furniture, tools and other items      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 576 552 623
Furniture, tools and other items | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 5,157 4,697  
Furniture, tools and other items | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (4,566) (4,133)  
Furniture, tools and other items | Impairment losses      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment (15) (12)  
PP&E in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,332 1,761 € 1,641
PP&E in progress | Gross cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,343 1,774  
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 € (11) € (13)