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Segment information - Summary of Reconciliation Between Reportable Segment Gross Profit and Loss to Consolidated Loss Before Tax (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [abstract] |  |  |
Segment gross profit | € 2,015 | € 1,722 | € 1,353
Research and development | (837) | (615) | (493)
Sales and marketing | (1,029) | (826) | (620)
General and administrative | (442) | (354) | (283)
Finance income | 94 | 275 | 455
Finance costs | (510) | (333) | (584)
Share in losses of associate | 0 | 0 | (1)
Loss before tax | € (709) | € (131) | € (173)

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