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Segment information - Summary of Non-current Asset by Geographic Area (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Non-current assets € 3,960 € 2,891  
Property and Equipment and Lease Right-of-Use Assets      
Disclosure of operating segments [line items]      
Non-current assets 757 780 € 197
Property and Equipment and Lease Right-of-Use Assets | Sweden      
Disclosure of operating segments [line items]      
Non-current assets 151 154 29
Property and Equipment and Lease Right-of-Use Assets | United States      
Disclosure of operating segments [line items]      
Non-current assets 504 525 142
Property and Equipment and Lease Right-of-Use Assets | United Kingdom      
Disclosure of operating segments [line items]      
Non-current assets 65 79 19
Property and Equipment and Lease Right-of-Use Assets | Other Countries      
Disclosure of operating segments [line items]      
Non-current assets € 37 € 22 € 7