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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

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