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FINANCIAL RISK MANAGEMENT - Effect of Foreign Currency Derivatives Impacts and Commercial Transactions Exposures (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net € (3) € 0 € (3) € 1
Unrealized gains / (losses) on foreign currency derivatives - net 0 (1) (2) 1
Losses reclassified from OCI as a result of hedge accounting discontinuation (5) 0 (5) 0
Included in Other gains / (losses) - net        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Losses reclassified from OCI as a result of hedge accounting discontinuation (5) 0 (5) 0
Derivatives that do not qualify for hedge accounting | Included in Other gains / (losses) - net        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net 0 1 2 3
Unrealized gains / (losses) on foreign currency derivatives - net (1) (1) (2) 1
Derivatives that qualify for hedge accounting | Included in Revenue        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net (3) (1) (5) (2)
Unrealized gains / (losses) on foreign currency derivatives - net 1 0 0 0
Derivatives that qualify for hedge accounting | Included in Other comprehensive income / (loss)        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Unrealized gains / (losses) on foreign currency derivatives - net 2 1 (6) (7)
Gains reclassified from cash flow hedge reserve to the Unaudited Interim Consolidated Income Statement € 3 € 1 € 6 € 2