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Income tax - Summary of Reconciliation Between Reported Tax Expense and Theoretical Tax Expense Loss Before Taxes (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Loss before tax € (709) € (131) € (173)
Tax using the Luxembourg tax rate (177) (33) (45)
Effect of tax rates in foreign jurisdictions 12 2 (11)
Permanent differences 54 58 (7)
Change in unrecognized deferred taxes (9) 29 (43)
Adjustments in respect of previous years (9) (1)
Other 1 0 11
Income tax (benefit)/expense € (128) € 55 € (95)