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Financial Risk Management and Financial Instruments - Summary of Changes in Investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]      
At January 1 € 2,277    
At December 31 916 € 2,277  
Tencent Music Entertainment Group      
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]      
At January 1 2,228 1,481 € 1,630
Changes in fair value recorded in other comprehensive income (loss) (1,376) 747 (149)
At December 31 € 852 € 2,228 € 1,481