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Financial Instruments - Summary of Assets and Liabilities Carried at Fair Value, Classification of Fair Value Calculations by Category (Parenthetical) (Detail) - Fair value [member] - EUR (€) € in Millions	Jun. 30, 2018	Dec. 31, 2017
Disclosure of Detailed Information about Financial Instruments [Line Items]
Derivatives assets, reported within trade receivables	€ 157	€ 57
Derivatives liabilities, reported within trade receivables	€ (46)	€ (113)

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Derivatives financial assets reported within trade receivables hedge trading activities.

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Derivatives financial liabilities reported within trade receivables hedge trading activities.

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