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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations € 872 € 899  
Plan assets (492) (488)  
Net defined benefit liability 380 411 $ 411
France      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 126 127  
Plan assets (6) (6)  
Net defined benefit liability 120 121  
Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 97 103  
Plan assets (1) (1)  
Net defined benefit liability 96 102  
Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 277 290  
Plan assets (267) (265)  
Net defined benefit liability 10 25  
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 372 379  
Plan assets (218) (216)  
Net defined benefit liability € 154 € 163