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Hedge Accounting - Additional Information (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Detailed Information about Hedges [Line Items]
Description of type of hedge	There are three types of hedge relations Fair value hedge, Cash flow hedge, and Hedge of net investment in foreign operations.
Risk factor designated coverage ratio	100.00%
Cash flow hedge reserve recognized	R$ (81)	R$ (29)	R$ (2,815)
Cash flow hedges [member]
Disclosure of Detailed Information about Hedges [Line Items]
Cash flow hedge reserve	(1,615)
Cash flow hedge reserve recognized	R$ (499)

X

- Definition

The description of the type of a hedge used by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 22
-Subparagraph a
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-URIDate 2017-03-09

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 23
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
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-URIDate 2017-03-09

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
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- Definition

A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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-Subparagraph e
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Risk exposure, coverage percentage.

+ References

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