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Hedge Accounting - Additional Information (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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$ (56)	R$ (81)	R$ (29)
Cash flow hedges [member]
Disclosure of Detailed Information about Hedges [Line Items]
Cash flow hedge reserve	(1,211)
Cash flow hedge reserve recognized	R$ (762)

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 2021-01-01
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- Definition

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+ References

No definition available.

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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

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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

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Risk exposure, coverage percentage.

+ References

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