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Financial Instruments - Summary of Derivative Contracts (Parenthetical) (Detail) - Derivative contract [member]	12 Months Ended
	Dec. 31, 2018
Bottom of range [member]
Disclosure of Derivative Contracts [Line items]
Risk Variable	25.00%
Top of range [member]
Disclosure of Derivative Contracts [Line items]
Risk Variable	50.00%

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- Definition

Disclosure of derivative contracts.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of positive and negative variation of risk variable.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: