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Short-term trade and other receivables for sales and services current receivables (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables € 2,228 € 1,677 € 1,600
Increase decrease in trade and other current receivables exchange rate 29 19  
Increase decrease in trade and other current receivables consolidation scope changes 1 (12)  
Increase decrease in trade and other current receivables other 522 70  
Trade receivables for sales and services [Member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 1,625 1,353 1,300
Increase decrease in trade and other current receivables exchange rate 24 15  
Increase decrease in trade and other current receivables consolidation scope changes 1 (12)  
Increase decrease in trade and other current receivables other 248 51  
Trade receivables for sales and services [Member] | Trade receivables [member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 1,088 963 962
Increase decrease in trade and other current receivables exchange rate 13 13  
Increase decrease in trade and other current receivables consolidation scope changes 1 (12)  
Increase decrease in trade and other current receivables other 111 1  
Trade receivables for sales and services [Member] | Bad debt provisions [Member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 227 216 209
Increase decrease in trade and other current receivables exchange rate (1) (1)  
Increase decrease in trade and other current receivables consolidation scope changes 0 0  
Increase decrease in trade and other current receivables other (10) (6)  
Trade receivables for sales and services [Member] | Net trade receivables [Member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 861 748 753
Increase decrease in trade and other current receivables exchange rate 12 12  
Increase decrease in trade and other current receivables consolidation scope changes 1 (12)  
Increase decrease in trade and other current receivables other 101 (5)  
Trade receivables for sales and services [Member] | Net completed work pending certification [Member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 573 446 406
Increase decrease in trade and other current receivables exchange rate 10 2  
Increase decrease in trade and other current receivables consolidation scope changes 0 0  
Increase decrease in trade and other current receivables other 118 38  
Trade receivables for sales and services [Member] | Retentions member [Member]      
Disclosure of detailed information about trade and other trade receivables for sales and services [Line Items]      
Trade and other current receivables 191 160 € 141
Increase decrease in trade and other current receivables exchange rate 3 1  
Increase decrease in trade and other current receivables consolidation scope changes 0 0  
Increase decrease in trade and other current receivables other € 28 € 18