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Segment information - Summary of Non-current Asset by Geographic Area (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Non-current assets € 2,798 € 3,960  
Property and Equipment and Lease Right-of-Use Assets      
Disclosure of operating segments [line items]      
Non-current assets 809 757 € 780
Property and Equipment and Lease Right-of-Use Assets | Sweden      
Disclosure of operating segments [line items]      
Non-current assets 148 151 154
Property and Equipment and Lease Right-of-Use Assets | United States      
Disclosure of operating segments [line items]      
Non-current assets 549 504 525
Property and Equipment and Lease Right-of-Use Assets | United Kingdom      
Disclosure of operating segments [line items]      
Non-current assets 58 65 79
Property and Equipment and Lease Right-of-Use Assets | Other Countries      
Disclosure of operating segments [line items]      
Non-current assets € 54 € 37 € 22