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Commitments and contingencies - Schedule of Minimum Purchase Obligations and Service Agreements With Minimum Spend Commitments Under Noncancellable Agreements (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Finance Leases And Operating Leases By Lessee [Line Items]      
Minimum purchase obligations and service agreements with minimum spend commitments under noncancellable agreements € 898 € 200 € 293
Not Later Than One Year      
Disclosure Of Finance Leases And Operating Leases By Lessee [Line Items]      
Minimum purchase obligations and service agreements with minimum spend commitments under noncancellable agreements 279 56 22
Later Than One Year But Not More Than 5 Years      
Disclosure Of Finance Leases And Operating Leases By Lessee [Line Items]      
Minimum purchase obligations and service agreements with minimum spend commitments under noncancellable agreements € 619 € 144 € 271