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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Net Defined Benefit Obligations by Country (Details)
€ in Millions, $ in Millions
Jun. 30, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations € 950 € 1,143  
Plan assets (489) (544)  
Net defined benefit liability 461 599 $ 599
France      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 124 158  
Plan assets (5) (5)  
Net defined benefit liability 119 153  
Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 106 134  
Plan assets (1) (2)  
Net defined benefit liability 105 132  
Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 241 306  
Plan assets (243) (268)  
Net defined benefit liability (2) 38  
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 479 545  
Plan assets (240) (269)  
Net defined benefit liability 239 276  
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations 0 0  
Plan assets 0 0  
Net defined benefit liability € 0 € 0