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Trade current assets and liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about working capital [Line Items]      
Balance working capital € (1,182) € (1,511) € (1,353)
Increase decrease in working capital exchange rate (21) 1  
Increase decrease in working capital consolidation scope changes 4 (11)  
Increase decrease in working capital other 345 (148)  
Inventories total [Member]      
Disclosure of detailed information about working capital [Line Items]      
Balance working capital 492 458 476
Increase decrease in working capital exchange rate 13 5  
Increase decrease in working capital consolidation scope changes 0 0  
Increase decrease in working capital other 21 (23)  
Trade and other current receivables [Member]      
Disclosure of detailed information about working capital [Line Items]      
Balance working capital 2,228 1,677 1,600
Increase decrease in working capital exchange rate 29 19  
Increase decrease in working capital consolidation scope changes 1 (12)  
Increase decrease in working capital other 522 70  
Trade and other current payables [Member]      
Disclosure of detailed information about working capital [Line Items]      
Balance working capital (3,902) (3,646) € (3,429)
Increase decrease in working capital exchange rate (63) (23)  
Increase decrease in working capital consolidation scope changes 4 1  
Increase decrease in working capital other € (198) € (195)