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Commitments and contingencies - Schedule of Minimum Guarantees Relating to Service, Majority Relate to Minimum Royalty Payments Associated with License Agreements for the use of Licensed Content (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Minimum Royalty Payments Associated With License Agreements [Line Items]      
Minimum royalty payments associated with license agreements € 3,576,000,000 € 1,040,000,000 € 700,000,000
Not Later Than One Year      
Disclosure Of Minimum Royalty Payments Associated With License Agreements [Line Items]      
Minimum royalty payments associated with license agreements 317,000,000 657,000,000 548,000,000
Later Than One Year But Not More Than 5 Years      
Disclosure Of Minimum Royalty Payments Associated With License Agreements [Line Items]      
Minimum royalty payments associated with license agreements € 3,259,000,000 € 383,000,000 € 152,000,000