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Financial Risk Management and Financial Instruments - Summary of Changes in Investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]      
At January 1 € 1,497    
At December 31 2,277 € 1,497  
Tencent Music Entertainment Group      
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]      
At January 1 1,481 1,630 € 910
Changes in fair value recorded in other comprehensive income (loss) 747 (149) 720
At December 31 € 2,228 € 1,481 € 1,630