v3.26.1
Deferred tax balances - Schedule of deferred income tax assets and liabilities during the year (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance € 729 € 707 € 542
(Charged)/credited to the income statement (48) 9 167
Transfers   11  
Exchange difference (10) 2 (2)
Additions through business combinations (Note 4) 347    
Ending Balance 1,018 729 707
Beginning Balance 240 241 477
(Charged)/credited to the income statement 53 (6) (226)
Exchange difference (27) 5 (10)
Additions through business combinations (Note 4) 563    
Ending Balance 829 240 241
Intangiable assets [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 134 110 335
(Charged)/credited to the income statement (42) 17 (217)
Exchange difference (14) 7 (8)
Ending Balance 78 134 110
Tangible assets [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 59 83 99
(Charged)/credited to the income statement 105 (22) (14)
Exchange difference (3) (2) (2)
Additions through business combinations (Note 4) 10    
Ending Balance 171 59 83
Deferred revenue [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
(Charged)/credited to the income statement (6)    
Exchange difference (3)    
Additions through business combinations (Note 4) 209    
Ending Balance 200    
Partnership basis [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
(Charged)/credited to the income statement (2)    
Exchange difference (5)    
Additions through business combinations (Note 4) 344    
Ending Balance 337    
Other [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 47 48 43
(Charged)/credited to the income statement (2) (1) 5
Exchange difference (2)    
Ending Balance 43 47 48
Losses and interest carried forward [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 654 658 296
(Charged)/credited to the income statement (13) (4) 363
Exchange difference (3)   (1)
Additions through business combinations (Note 4) 121    
Ending Balance 759 654 658
Tax credits [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 20 6 206
(Charged)/credited to the income statement (4) 14 (200)
Exchange difference (1)    
Additions through business combinations (Note 4) 2    
Ending Balance 17 20 6
Tangible assets [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 5 5  
(Charged)/credited to the income statement 52   5
Exchange difference (1)    
Additions through business combinations (Note 4) 76    
Ending Balance 132 5 5
Intangible assets [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 12 16 20
(Charged)/credited to the income statement (34) (4) (4)
Additions through business combinations (Note 4) 46    
Ending Balance 24 12 16
Trade and other receivables [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 20 17 15
(Charged)/credited to the income statement (7) 2 3
Exchange difference (2) 1 (1)
Additions through business combinations (Note 4) 4    
Ending Balance 15 20 17
Leases [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
(Charged)/credited to the income statement 3    
Additions through business combinations (Note 4) 14    
Ending Balance 17    
Other [Member]      
Disclosure Of Movement In Deferred Income Tax Assets And Liabilities During The Year [Line Items]      
Beginning Balance 18 5 5
(Charged)/credited to the income statement (45) 1  
Transfers   11  
Exchange difference (3) 1  
Additions through business combinations (Note 4) 84    
Ending Balance € 54 € 18 € 5