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Income tax - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income Tax [Line Items]      
Income tax (benefit)/expense relating to components of other comprehensive (loss)/income € 163,000,000 € (31,000,000) € 147,000,000
Deferred tax liability recognized on investment in subsidiaries € 0    
Luxembourg      
Disclosure Of Income Tax [Line Items]      
Statutory tax rate 24.94% 24.94% 26.01%
Provisions      
Disclosure Of Income Tax [Line Items]      
Uncertain tax position liability € 5,000,000    
Uncertain tax position liability, expected to be resolved € 4,000,000