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Discontinued operations - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of analysis of single amount of discontinued operations [line items]      
Impairment loss recognized on the remeasurement to fair value less costs to sell € 0 € (514) € 0
Cash consideration received 40 98  
Gain on sale before tax € 22 29 € 0
Submarine Networks      
Disclosure of analysis of single amount of discontinued operations [line items]      
Gain on sale after tax   29  
Gain on sale before tax   € 29  
Proportion of ownership interest in associate (as percent) 20.00%