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PROVISIONS - Changes in Provisions (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Changes in other provisions [abstract]    
At January 1, 2022 € 117  
Allowance 1  
Amounts used (3)  
Unused amounts reversed (2)  
Effects of changes in foreign exchange rates 5  
At June 30, 2022 118  
Of which non-current 96 € 97
Of which current 22 20
Total provisions 118 117
Close down and environmental remediation costs    
Changes in other provisions [abstract]    
At January 1, 2022 88  
Allowance 0  
Amounts used (1)  
Unused amounts reversed 0  
Effects of changes in foreign exchange rates 3  
At June 30, 2022 90  
Of which non-current 80  
Of which current 10  
Total provisions 90 88
Restructuring costs    
Changes in other provisions [abstract]    
At January 1, 2022 2  
Allowance 0  
Amounts used (1)  
Unused amounts reversed 0  
Effects of changes in foreign exchange rates 0  
At June 30, 2022 1  
Of which non-current 1  
Of which current 0  
Total provisions 1 2
Legal claims and other costs    
Changes in other provisions [abstract]    
At January 1, 2022 27  
Allowance 1  
Amounts used (1)  
Unused amounts reversed (2)  
Effects of changes in foreign exchange rates 2  
At June 30, 2022 27  
Of which non-current 15  
Of which current 12  
Total provisions € 27 € 27