v3.26.1
Property, plant and equipment - Additional Information (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation Expense € 836,000,000 € 650,000,000 € 603,000,000
Property, Plant and Equipment, Pledged as Security 0 0 0
Property, Plant and Equipment Impairment 115,000,000 290,000,000 56,000,000
Reversals Previous Impairment Charges on Property Plant and Equipment € 42,000,000 74,000,000 30,000,000
Percentage of Discount and Growth Rate 1.00%    
Percentage of Specific Rate Based on Valuation and Cash Flow Projection 5.00%    
Percentage of Declining Growth Rate on Satellites and Orbital Slot Rights 1.00%    
Increase in Impairment on Satellites and Orbital Slot Rights € 13,000,000    
Percentage of Increase in Growth Rate on Satellites and Orbital Slot Rights after Discount Rate 1.00%    
Increase in Impairment on Satellites and Orbital Slot Rights after Discount Rate € 34,000,000    
Percentage of Increase in Growth Rate Taken Together on Satellites And Orbital Slot Rights after Discount Rate 1.00%    
Percentage of Declining Growth Rate on Satellites and Orbital Slot Rights after Discount Rate 1.00%    
Decrease in Impairment on Satellites and Orbital Slot Rights after Discount Rate € 78,000,000    
Percentage of Reduction in Growth Rate on Satellites and Orbital Slot Rights 5.00%    
Increase in Impairment on Satelights € 52,000,000    
Geo Satelites [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation Expense 8,000,000    
Space Segment Assets [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, Plant and Equipment Impairment € 73,000,000 € 216,000,000 € 26,000,000