v3.25.0.1
Income tax - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Income Tax [Line Items]      
Income tax (benefit)/expense relating to components of other comprehensive (loss)/income € 83,000,000 € 13,000,000 € 26,000,000
Deferred tax liability recognized on investment in subsidiaries 0    
Luxembourg      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 37,000,000    
United States      
Disclosure Of Income Tax [Line Items]      
Unrecognized deferred tax assets 780,000,000    
Net operating loss carry-forwards 238,000,000    
United States | Federal      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 7,000,000    
United States | State And Local      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 231,000,000    
Sweden      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 870,000,000    
India      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 117,000,000    
Other foreign countries      
Disclosure Of Income Tax [Line Items]      
Net operating loss carry-forwards 43,000,000    
Provisions      
Disclosure Of Income Tax [Line Items]      
Uncertain tax position liability, expected to be resolved 21,000,000    
Uncertain tax position liability 29,000,000    
Uncertain tax positions expected to be resolved in the next twelve months € 0