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Goodwill and intangible assets - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2020
EUR (€)
segment
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Number of operating segments | segment 2    
Percentage of weightings 50.00%    
Discount rate     13.00%
Revenue multiple used to estimate enterprise value     3.0
Research and Development      
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Amortization expense | € € 18 € 14 € 11
Income Approach | Premium      
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Discount rate 8.00%    
Income Approach | Ad-Supported      
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Discount rate 8.50%    
Market Approach | Bottom of Range      
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Revenue multiple used to estimate enterprise value 4.0    
Market Approach | Top of Range      
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]      
Revenue multiple used to estimate enterprise value 6.5