v3.26.1
Investments accounted for using equity method - Schedule of Joint Ventures (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
Disclosure of joint ventures [line items]  
Carrying amount € 77
Horizons-4 Satellite LLC [Member]  
Disclosure of joint ventures [line items]  
Name of entity Horizons-4 Satellite LLC
Country of incorporation USA
% interest 50.00%
Nature of relationship Joint venture
Measurement method Equity
Quoted fair value € 0 [1]
Carrying amount € 13
Horizons-3 Satellite LLC [Member]  
Disclosure of joint ventures [line items]  
Name of entity Horizons-3 Satellite LLC
Country of incorporation USA
% interest 50.00%
Nature of relationship Joint venture
Measurement method Equity
Quoted fair value € 0 [1]
Carrying amount € 64
[1] Private entities – no quoted prices available