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Income tax - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Tax [Line Items]      
Income tax (benefit)/expense relating to components of other comprehensive (loss)/income € (268,000,000) € 163,000,000 € (31,000,000)
Tax effect of gain on sale of long term investment reclassified to accumulated deficit 30,000,000    
Deferred tax liability recognized on investment in subsidiaries € 0    
Luxembourg      
Disclosure Of Income Tax [Line Items]      
Statutory tax rate 24.94%    
Provisions      
Disclosure Of Income Tax [Line Items]      
Uncertain tax position liability, expected to be resolved € 2,000,000    
Uncertain tax position liability 6,000,000    
Uncertain tax positions expected to be resolved in the next twelve months 2,000,000    
Gross impact of uncertain tax positions € 35,000,000