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FINANCIAL RISK MANAGEMENT - Impact on Profit and Equity (Before Tax Effect) of a 10% Strengthening of US Dollar Versus Euro for Non-US Dollar Functional Currency Entities (Details) - 10% strengthening U.S. Dollar/Euro
€ in Millions
 12 Months Ended
Dec. 31, 2020
EUR (€)
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax € 23
Effect on pretax equity (30)
Net commercial transaction exposure  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 23
Effect on pretax equity (30)
Net financing transaction exposure  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 0
Effect on pretax equity 0
Trade receivables  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 2
Effect on pretax equity
Trade payables  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax (2)
Effect on pretax equity
Derivatives on commercial transactions  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 23
Effect on pretax equity (30)
Cash in Bank and intercompany loans  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 123
Effect on pretax equity
Borrowings  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax (170)
Effect on pretax equity
Derivatives on financing transactions  
Disclosure of nature and extent of risks arising from financial instruments [line items]  
Effect on profit before tax 47
Effect on pretax equity