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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Amounts Recognized in the Consolidated Income Statement (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]              
Current service cost € (8) € (6) € (15) € (14)      
Past service cost (2) (2) (2) (2)      
Net interest (2) (3) (4) (6)      
Immediate recognition of gains arising over the year 0 (1) 1 0      
Administration expenses 0 (1) (1) (1)      
Total (12) (13) (21) (23)      
Pension Benefits              
Disclosure of defined benefit plans [line items]              
Current service cost (6) (5) (11) (11)      
Past service cost 0 0 0 0      
Net interest (1) (2) (2) (3)      
Immediate recognition of gains arising over the year 0 0 0 0      
Administration expenses 0 (1) (1) (1)      
Total (7) (8) (14) (15)      
Other Benefits              
Disclosure of defined benefit plans [line items]              
Current service cost (2) (1) (4) (3)      
Past service cost (2) (2) (2) (2) € (2) € (3) € 36
Net interest (1) (1) (2) (3)      
Immediate recognition of gains arising over the year 0 (1) 1 0      
Administration expenses 0 0 0 0      
Total € (5) € (5) € (7) € (8)