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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
EUR (€)
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations € 899 € 864    
Plan assets (488) (461)    
Net defined benefit liability 411 403 $ 403 € 599
France        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 127 117    
Plan assets (6) (6)    
Net defined benefit liability 121 111    
Germany        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 103 100    
Plan assets (1) (1)    
Net defined benefit liability 102 99    
Switzerland        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 290 249    
Plan assets (265) (236)    
Net defined benefit liability 25 13    
United States        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 379 398    
Plan assets (216) (218)    
Net defined benefit liability € 163 € 180