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PROVISIONS - Changes in Provisions (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Changes in other provisions [abstract]    
At January 1, 2023 € 111  
Allowance 1  
Amounts used (2)  
Unused amounts reversed (1)  
At June 30, 2023 109  
Of which non-current 89 € 90
Of which current 20 21
Total provisions 109 111
Close down and environmental remediation costs    
Changes in other provisions [abstract]    
At January 1, 2023 86  
Allowance 0  
Amounts used (1)  
Unused amounts reversed 0  
At June 30, 2023 85  
Of which non-current 74  
Of which current 11  
Total provisions 85 86
Restructuring costs    
Changes in other provisions [abstract]    
At January 1, 2023 0  
Allowance 0  
Amounts used 0  
Unused amounts reversed 0  
At June 30, 2023 0  
Of which non-current 0  
Of which current 0  
Total provisions 0 0
Legal claims and other costs    
Changes in other provisions [abstract]    
At January 1, 2023 25  
Allowance 1  
Amounts used (1)  
Unused amounts reversed (1)  
At June 30, 2023 24  
Of which non-current 15  
Of which current 9  
Total provisions € 24 € 25