v3.25.4
Taxation - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Income Tax (Credit) [Line Items]      
Uncertain tax provision € 833 € 888  
Pillar 2 income taxes 21 9 € 0
Unused tax losses for which deferred tax asset recognised or not 2,241 2,245  
Unused tax credits for which deferred tax asset recognised or not 813 795  
Unused tax losses for which no deferred tax asset recognised 620 695  
Unused tax credits for which no deferred tax asset recognised 291 502  
Tax losses for which deferred tax has not been recognized and which have a date to expire 237 246  
Other deductible temporary differences for which no deferred tax asset recognised 1,187 986  
Other deductible temporary differences for which no deferred tax asset recognised, interest expense 1,138 868  
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised 1,764 2,013  
India      
Disclosure Of Income Tax (Credit) [Line Items]      
Uncertain tax provision, amortisation of intangible assets € 464 € 506