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Taxation - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Income Tax (Credit) [Line Items]    
Uncertain tax provision € 820 € 822
Unused tax losses for which deferred tax asset recognised or not 1,313 1,352
Unused tax credits for which deferred tax asset recognised or not 832 893
Unused tax losses for which no deferred tax asset recognised 602 668
Unused tax credits for which no deferred tax asset recognised 418 448
Tax losses for which deferred tax has not been recognized and which have a date to expire 168 196
Other deductible temporary differences for which no deferred tax asset recognised 515 269
Other deductible temporary differences for which no deferred tax asset recognised, interest expense 409 199
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised € 2,610 2,420
Bottom of range    
Disclosure Of Income Tax (Credit) [Line Items]    
Pillar Two, estimated future increase in Group effective tax rate 0.00%  
Top of range    
Disclosure Of Income Tax (Credit) [Line Items]    
Pillar Two, estimated future increase in Group effective tax rate 0.20%  
India    
Disclosure Of Income Tax (Credit) [Line Items]    
Uncertain tax provision, amortisation of intangible assets € 434 € 374