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TRADE PAYABLES AND OTHER - Contract Liabilities (Details) - EUR (€)
€ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of disaggregation of contract liabilities with customers [line items]    
Non-current € 3 € 3
Current 62 81
Deferred tooling revenue    
Disclosure of disaggregation of contract liabilities with customers [line items]    
Non-current 2 2
Current 0 0
Advance payment from customers    
Disclosure of disaggregation of contract liabilities with customers [line items]    
Non-current 0 0
Current 1 2
Unrecognized variable consideration    
Disclosure of disaggregation of contract liabilities with customers [line items]    
Non-current 1 1
Current 59 72
Other    
Disclosure of disaggregation of contract liabilities with customers [line items]    
Non-current 0 0
Current € 2 € 7