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Issued Share Capital and Other Reserves - Additional Information (Details)
€ / shares in Units, $ / shares in Units, € in Millions
 1 Months Ended 12 Months Ended 26 Months Ended
Jul. 13, 2020
beneficiaryCertificate
shares
Oct. 17, 2019
shares
Oct. 04, 2019
EUR (€)
shares
Jul. 01, 2019
EUR (€)
shares
Jul. 01, 2019
$ / shares
Nov. 05, 2018
EUR (€)
shares
Nov. 05, 2018
USD ($)
shares
Apr. 03, 2018
EUR (€)
Feb. 16, 2018
beneficiaryCertificate
Dec. 29, 2017
USD ($)
shares
Dec. 15, 2017
USD ($)
Jul. 13, 2017
EUR (€)
shares
Jul. 13, 2017
$ / shares
Oct. 17, 2016
EUR (€)
shares
Oct. 17, 2016
$ / shares
Jan. 31, 2018
USD ($)
shares
Dec. 31, 2020
EUR (€)
beneficiaryCertificate
€ / shares
shares
Dec. 31, 2019
EUR (€)
beneficiaryCertificate
€ / shares
shares
Dec. 31, 2018
EUR (€)
€ / shares
shares
Dec. 31, 2020
EUR (€)
beneficiaryCertificate
€ / shares
shares
Jan. 01, 2018
shares
Dec. 31, 2017
USD ($)
shares
Dec. 15, 2017
EUR (€)
shares
Disclosure of classes of share capital [line items]                                              
Authorized and subscribed shares                                 403,032,520 403,032,520 403,032,520 403,032,520      
Authorized and subscribed shares, par value | € / shares                                 € 0.000625 € 0.000625 € 0.000625 € 0.000625      
Proceeds from warrants issued | €       € 15                                      
Number of ordinary shares that can be acquired from warrants issued       800,000                                      
Exercise price of each warrant | $ / shares         $ 190.09                                    
Exercise price of each warrant to fair market value of ordinary shares on date of issuance       1.30%                                      
Ordinary shares issued 1,084,043 1,991,627 1,600,000             1,754,960           9,431,960         9,431,960   4,800,000
Number of warrants exercised     1,600,000                                        
Proceeds from exercise of warrants | €     € 74                           € 0 € 74 € 0        
Number of warrants effectively net settled 1,600,000 3,520,000                                          
Long term investments | €                                 2,277 € 1,497   € 2,277      
Convertible notes exchanged principal amount | $                   $ 110,000,000 $ 301,000,000         $ 628,000,000              
Number of beneficiary certificates issued per share | beneficiaryCertificate                 10                            
Convertible notes | €               € 1,100                 € 1,100            
Approved share repurchase amount | €           € 510                                  
Number of ordinary shares repurchased           4,366,427 4,366,427                   5,038,200 3,679,156          
Number of treasury shares reissued                                 4,802,847 3,557,405          
Number of ordinary shares held as treasury shares                                 3,402,063 3,166,710   3,402,063      
Number of beneficiary certificates held by founders | beneficiaryCertificate                                 365,014,840 378,201,910   365,014,840      
November 5, 2018 Program                                              
Disclosure of classes of share capital [line items]                                              
Approved share repurchase amount | €                                       € 510      
Number of ordinary shares repurchased                                       4,366,427      
Top of Range                                              
Disclosure of classes of share capital [line items]                                              
Ordinary shares authorized to be repurchased           10,000,000 10,000,000                                
Approved share repurchase amount | $             $ 1,000,000,000.0                                
Certain Members of Key Management                                              
Disclosure of classes of share capital [line items]                                              
Proceeds from warrants issued | €       € 15                   € 27                  
Number of ordinary shares that can be acquired from warrants issued       800,000                   5,120,000                  
Exercise price of each warrant | $ / shares         $ 190.09                   $ 50.61                
Exercise price of each warrant to fair market value of ordinary shares on date of issuance       130.00%                   120.00%                  
Ordinary shares issued   1,991,627 1,600,000                                        
Number of warrants exercised     1,600,000                                        
Proceeds from exercise of warrants | €     € 74                                        
Number of warrants effectively net settled   3,520,000                                          
Employee and Member of Management of Group                                              
Disclosure of classes of share capital [line items]                                              
Proceeds from warrants issued | €                       € 9                      
Number of ordinary shares that can be acquired from warrants issued                       1,600,000                      
Exercise price of each warrant | $ / shares                         $ 89.73                    
Exercise price of each warrant to fair market value of ordinary shares on date of issuance                       130.00%                      
Ordinary shares issued 1,084,043                                            
Number of warrants effectively net settled 1,600,000                                            
Number of beneficiary certificates issued | beneficiaryCertificate 10,840,430                                            
TME                                              
Disclosure of classes of share capital [line items]                                              
Ordinary shares issued                                             8,552,440
Long term investments | €                                             € 910
Transfer restrictions period                                 3 years            
December 15 and 29, 2017 | Convertible Notes                                              
Disclosure of classes of share capital [line items]                                              
Ordinary shares issued                                           6,554,960  
Debt principal amount | $                                           $ 411,000,000  
Accrued interest | $                                           $ 37,000,000  
Number of Ordinary Shares Outstanding                                              
Disclosure of classes of share capital [line items]                                              
Number of shares issued and fully paid                                 193,614,910 187,492,667 183,901,040 193,614,910      
Number of ordinary shares repurchased                                 5,038,200 3,679,156 6,427,271