Risk Management Policy - Comparative Structure of Financial Debt According to Fixed and /or Protected Interest Rate on Gross Debt (Detail)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Fixed interest rate [member]
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]
Interest rate risk	98.00%	71.00%

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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