v3.26.1
Employee benefit obligations - Schedule of significant actuarial assumptions and sensitivity analysis (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Staff Retirement Plan [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Discount rate 5.22%  
Duration used to set discount rate (in years) 8 years 2 months 12 days  
Mortality assumption PRI-2012(no collaradjustment)and ScaleMMP-2021  
Discount rate 5.48  
Staff Retirement Plan [Member] | Bottom of range [member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Price inflation 2.50%  
Price inflation 2.63  
Staff Retirement Plan [Member] | Top of range [member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Price inflation 2.40%  
Price inflation 2.2  
Restoration Plans [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Discount rate 5.00%  
Duration used to set discount rate (in years) 6 years 7 months 9 days  
Mortality assumption PRI-2012(whitecollaradjustment)and ScaleMMP-2021  
Discount rate 5.3  
Restoration Plans [Member] | Bottom of range [member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Price inflation 2.50%  
Price inflation 2.63  
Restoration Plans [Member] | Top of range [member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Price inflation 2.40%  
Price inflation 2.2  
Intelsat Postretirement Benefit Plan [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Discount rate 5.06%  
Duration used to set discount rate (in years) 6 years 11 months 26 days  
Immediate trend rate 7.02  
Ultimate trend rate 3.95  
Year rate reaches ultimate trend rate 2050 years  
Mortality assumption PRI-2012(no collaradjustment)and ScaleMMP-2021  
Discount rate 5.34  
Immediate trend rate 6.64  
Ultimate trend rate 3.94  
Year rate reaches ultimate trend rate 2049 years  
SES postretirement benefit plan [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Discount rate 4.99%  
Immediate trend rate 8.5  
Ultimate trend rate 4  
Year rate reaches ultimate trend rate   2045 years
Mortality assumption PRI-2012  
Discount rate 5.07  
Actuarial assumption of discount rates [member] | Staff Retirement Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation € 244  
Actuarial assumption of discount rates [member] | Staff Retirement Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 287  
Actuarial assumption of discount rates [member] | Restoration Plans [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 5  
Actuarial assumption of discount rates [member] | Restoration Plans [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 6  
Actuarial assumption of discount rates [member] | Intelsat Postretirement Benefit Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 16  
Actuarial assumption of discount rates [member] | Intelsat Postretirement Benefit Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 18  
Actuarial assumption of discount rates [member] | SES postretirement benefit plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 6  
Actuarial assumption of discount rates [member] | SES postretirement benefit plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 6  
Actuarial assumption of expected rates of inflation [member] | Staff Retirement Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 281  
Actuarial assumption of expected rates of inflation [member] | Staff Retirement Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 250  
Actuarial assumption of expected rates of inflation [member] | Restoration Plans [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 6  
Actuarial assumption of expected rates of inflation [member] | Restoration Plans [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 5  
Actuarial assumption of medical cost trend rates [member] | Intelsat Postretirement Benefit Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 18  
Actuarial assumption of medical cost trend rates [member] | Intelsat Postretirement Benefit Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 16  
Actuarial assumption of mortality rates [member] | Staff Retirement Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 254  
Actuarial assumption of mortality rates [member] | Staff Retirement Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 274  
Actuarial assumption of mortality rates [member] | Restoration Plans [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 5  
Actuarial assumption of mortality rates [member] | Restoration Plans [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 6  
Actuarial assumption of mortality rates [member] | Intelsat Postretirement Benefit Plan [Member] | Increase Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation 16  
Actuarial assumption of mortality rates [member] | Intelsat Postretirement Benefit Plan [Member] | Decrease Hundred Basis Points [Member]    
Disclosure Of Significant Actuarial Assumptions And Sensitivity Analysis [Line Items]    
Present value of defined benefit obligation € 18