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OTHER GAINS AND LOSSES—NET (Details) - EUR (€)
€ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]        
Realized gains / (losses) on derivatives   € (6) € 113 € (35)
Losses reclassified from OCI as a result of hedge accounting discontinuation   0 0 (6)
Realized and unrealized (losses) / gains on debt derivatives at fair value   (47) 39 16
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities – net   (1) 1 1
Impairment of assets   0 0 (43)
Restructuring costs   (1) (3) (13)
(Losses) / gains on pension plan amendments   47 (32) (2)
Losses on disposal   (4) (3) (4)
Other   4 2 (3)
Total other gains and losses - net   (8) 117 (89)
Disclosure of income tax expense [line Items]        
Impairment charge   0 0 43
(Losses) / gains on pension plan amendments   47 (32) (2)
Collective bargaining agreement, period 3 years      
OPEB        
Analysis of income and expense [abstract]        
(Losses) / gains on pension plan amendments   49    
Disclosure of income tax expense [line Items]        
Negative past service cost recorded to cancel gain originally recognized     € 31  
(Losses) / gains on pension plan amendments   € 49    
COVID-19        
Analysis of income and expense [abstract]        
Losses reclassified from OCI as a result of hedge accounting discontinuation       (6)
COVID-19 | A&T and AC&I        
Analysis of income and expense [abstract]        
Impairment of assets       (43)
Disclosure of income tax expense [line Items]        
Impairment charge       € 43