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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
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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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- Details
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