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Other operating expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other operating expenses [Line Items]      
Increase decrease in other operating expenses € (53) € (696)  
Miscellaneous other operating expense 4,931 4,878 € 4,182
Subcontracted Work [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses (213) (362)  
Miscellaneous other operating expense 3,550 3,337 2,975
Leases expenses [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses (6) 6  
Miscellaneous other operating expense 257 251 257
Repairs and maintenance [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses 7 7  
Miscellaneous other operating expense 75 82 89
Independent professional services [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses 31 (36)  
Miscellaneous other operating expense 454 485 449
Changes in provisions for liabilities [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses (89) 121  
Miscellaneous other operating expense 36 53 68
Other operating expenses [Member]      
Other operating expenses [Line Items]      
Increase decrease in other operating expenses 39 (190)  
Miscellaneous other operating expense € 631 € 670 € 480