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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Included in the Unaudited Interim Consolidated Income Statement            
Disclosure of defined benefit plans [line items]            
Current service cost € (6) € (6) € (14) € (12)    
Past service cost (2) 0 (2) 0    
Net interest (3) (4) (6) (8)    
Immediate recognition of gains / (losses) arising over the period (1) (2) 0 (2)    
Administration expenses (1) 0 (1) (1)    
Total (13) (12) (23) (23)    
Pension Benefits | Included in the Unaudited Interim Consolidated Income Statement            
Disclosure of defined benefit plans [line items]            
Current service cost (5) (5) (11) (9)    
Past service cost 0 0 0 0    
Net interest (2) (2) (3) (4)    
Immediate recognition of gains / (losses) arising over the period 0 0 0 0    
Administration expenses (1) 0 (1) (1)    
Total (8) (7) (15) (14)    
Other Benefits            
Disclosure of defined benefit plans [line items]            
Past service cost     (2)   € (3) € (36)
Other Benefits | Included in the Unaudited Interim Consolidated Income Statement            
Disclosure of defined benefit plans [line items]            
Current service cost (1) (1) (3) (3)    
Past service cost (2) 0 (2) 0    
Net interest (1) (2) (3) (4)    
Immediate recognition of gains / (losses) arising over the period (1) (2) 0 (2)    
Administration expenses 0 0 0 0    
Total € (5) € (5) € (8) € (9)