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Capital Management and Solvency - Composition of Total Capitalization and Calculation of Gross Financial Leverage Ratio (Parenthetical) (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of capital management and solvency [line items]
Senior debt for the gross financial leverage	€ 1,738	€ 1,774
Currency swap contract [member]
Disclosure of capital management and solvency [line items]
Senior debt for the gross financial leverage	€ (7)	€ (1)

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Disclosure of capital management and solvency.

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Senior leverage.

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