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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Jun. 30, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations € 1,085 € 1,122  
Plan assets (504) (458)  
Net defined benefit liability 581 664 $ 664
France      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 163 168  
Plan assets (5) (5)  
Net defined benefit liability 158 163  
Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 134 143  
Plan assets (2) (1)  
Net defined benefit liability 132 142  
Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 295 310  
Plan assets (248) (223)  
Net defined benefit liability 47 87  
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 492 500  
Plan assets (249) (229)  
Net defined benefit liability 243 271  
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 1 1  
Plan assets 0 0  
Net defined benefit liability € 1 € 1