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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations € 1,143 € 1,122    
Plan assets (544) (458)    
Net defined benefit liability 599 664 $ 664 € 670
France        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 158 168    
Plan assets (5) (5)    
Net defined benefit liability 153 163    
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 306 310    
Plan assets (268) (223)    
Net defined benefit liability 38 87    
United States        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 545 500    
Plan assets (269) (229)    
Net defined benefit liability 276 271    
Other        
Disclosure of net defined benefit liability (asset) [line items]        
Defined benefit obligations 0 1    
Plan assets 0 0    
Net defined benefit liability € 0 € 1