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Financial Risk Management - Summary of Effect of Foreign Currency Derivatives Impacts and Commercial Transactions Exposures (Detail) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net   € (1) € 1 € 1
Unrealized (losses) / gains on foreign currency derivatives - net € (1) 4 1 3
Derivatives that do not qualify for hedge accounting [member] | Other gains (losses) [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net 2 (1) 4 (2)
Unrealized (losses) / gains on foreign currency derivatives - net (1) 5 1 4
Derivatives that qualify for hedge accounting [member] | Other gains (losses) [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net (1) (2) (1) (1)
Derivatives that qualify for hedge accounting [member] | Revenue [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net (1) 2 (2) 4
Unrealized (losses) / gains on foreign currency derivatives - net   (1)   (1)
Derivatives that qualify for hedge accounting [member] | Other comprehensive income (loss) [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Unrealized (losses) / gains on foreign currency derivatives - net 1 (22) (7) (11)
Gains / (Losses) reclassified from cash flow hedge reserve to Consolidated Income Statement € 1 € (1) € 2 € (3)