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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Jun. 30, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations € 1,150 € 1,115  
Plan assets (435) (445)  
Net defined benefit liability 715 670 $ 670
France      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 164 161  
Plan assets (3) (3)  
Net defined benefit liability 161 158  
Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 140 144  
Plan assets (1) (1)  
Net defined benefit liability 139 143  
Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 303 299  
Plan assets (213) (214)  
Net defined benefit liability 90 85  
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 542 510  
Plan assets (218) (227)  
Net defined benefit liability 324 283  
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