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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net € (1) € (1) € 1 € (11)
Included in Unrealized (losses) / gains on foreign currency derivatives - net 4 7 3 13
Derivatives that do not qualify for hedge accounting [member] | Other gains and losses [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net (1) (2) (2) (11)
Included in Unrealized (losses) / gains on foreign currency derivatives - net 5 5 4 12
Derivatives that qualify for hedge accounting [member] | Other gains and losses [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net (2)   (1)  
Realized gains / (losses) in ineffective portion of derivatives 0 0 0 0
Derivatives that qualify for hedge accounting [member] | Revenue [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net 2 (1) 4 (2)
Included in Unrealized (losses) / gains on foreign currency derivatives - net (1) 2 (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]        
Included in Unrealized (losses) / gains on foreign currency derivatives - net (22) 25 (11) 28
(Losses) / gains reclassified from cash flow hedge reserve to Consolidated Income Statement € (1) € (1) € (3) € 1