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OTHER GAINS AND LOSSES—NET (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]      
Realized gains / (losses) on derivatives € 113 € (35) € (49)
Losses reclassified from OCI as a result of hedge accounting discontinuation 0 (6) 0
Unrealized gains on derivatives at fair value through profit and loss - net 39 16 33
Unrealized exchange gains from the remeasurement of monetary assets and liabilities – net 1 1 0
Impairment of assets 0 (43) 0
Restructuring costs (3) (13) (4)
(Losses) / gains on pension plan amendments (32) (2) 1
Losses on disposal (3) (4) (3)
Other 2 (3) (1)
Total other gains and losses - net 117 (89) (23)
Disclosure of income tax expense [line Items]      
Impairment charge 0 43 € 0
OPEB      
Disclosure of income tax expense [line Items]      
Negative past service cost recorded to cancel gain originally recognized € 31    
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