v3.26.1
Financial Risk Management Objectives and Policies - Schedule of Movement in Provisions for Trade Receivables and Unbilled Accrued Revenue (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial Risk Management Objectives And Policies [Abstract]      
At 1 January - trade receivables € 80 € 96 € 100
Business combination 21    
Increase in provision recognized in profit or loss 16 30 41
Receivables written off as uncollectible (15) (18) (13)
Unused amount reversed (27) (31) (29)
Other movements - trade receivables 0    
Impact of currency translation - trade receivables (5) 3 (3)
At 31 December - trade receivables 70 80 96
At 1 January - accrued revenue 34 18 14
Business combination - accrued revenue 2    
Increase in provision recognized in profit or loss - accrued revenue 32 9 1
Receivables written off as uncollectible - accrued revenue (5) 8 8
Unused amount reversed - accrued revenue (2) (2) (1)
Other movements - accrued revenue 6   (3)
Impact of currency translation - accrued revenue (3) 1 (1)
At 31 December - accrued revenue € 64 € 34 € 18