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BORROWINGS - Movement in Borrowings (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Aug. 08, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]              
Beginning Balance     € 2,361   € 2,361    
Cash flows              
Proceeds from issuance of Senior Notes       € 0 290 € 0 € 0
Repayments of Senior Notes         (200) (100) 0
Repayments of U.S. revolving credit facility         (129)    
Proceeds from U.S. revolving credit facility           105  
Proceeds from other borrowings         202 8 0
Repayments from other borrowings         (10) (4) (1)
Lease repayments         (35) (86)  
Payment of deferred financing costs         (6) 0  
Non-cash changes              
Borrowings assumed through business combination         0 75  
Movement in interests accrued or capitalized         (1) 1  
Changes in leases and other loans         62 75  
Deferred arrangement fees         5 5  
Effects of changes in foreign exchange rates         (148) 29  
Ending Balance         2,391 2,361  
Borrowings     2,361   2,361 2,361  
Senior Unsecured Notes due 2021              
Disclosure of detailed information about borrowings [line items]              
Beginning Balance     € 200   200    
Cash flows              
Repayments of Senior Notes € (200) € (100)          
Non-cash changes              
Ending Balance   300     € 0 200  
Nominal rate     4.625%   4.625%    
Borrowings   € 300 € 200   € 200 200  
Previously stated              
Disclosure of detailed information about borrowings [line items]              
Beginning Balance       2,151   2,151  
Non-cash changes              
Ending Balance             2,151
Borrowings       2,151   2,151 2,151
IFRS 16 application | IFRS 16              
Disclosure of detailed information about borrowings [line items]              
Beginning Balance       102   102  
Non-cash changes              
Ending Balance             102
Borrowings       102   102 102
Restated              
Disclosure of detailed information about borrowings [line items]              
Beginning Balance       2,253   2,253  
Non-cash changes              
Ending Balance             2,253
Borrowings       € 2,253   € 2,253 € 2,253