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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Narrative (Details) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2018
Disclosure of defined benefit plans [line items]          
Collective bargaining agreement, period 3 years        
Increase (reduction) in pension obligation   € 0 € (47)    
Gains on pension plan amendments   € 0 € 47 € (32)  
Weighted-average maturity of defined benefit obligations   11 years 6 months 11 years 2 months 12 days    
Defined benefit obligations          
Disclosure of defined benefit plans [line items]          
Increase (reduction) in pension obligation   € (4) € (47)    
Other Benefits          
Disclosure of defined benefit plans [line items]          
Gains on pension plan amendments         € 36
Expected contributions to pension and other benefits for next year   16      
Other Benefits | Defined benefit obligations          
Disclosure of defined benefit plans [line items]          
Increase (reduction) in pension obligation   0 (49)    
OPEB          
Disclosure of defined benefit plans [line items]          
Gains on pension plan amendments     49    
Loss recognized on disputes about plan changes       € 31  
Pension Benefits          
Disclosure of defined benefit plans [line items]          
Expected contributions to pension and other benefits for next year   32      
Pension Benefits | Defined benefit obligations          
Disclosure of defined benefit plans [line items]          
Increase (reduction) in pension obligation   € (4) € 2