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Loans, Financings and Debentures - Summary of Guarantees of the Debtor Balance on Loans and Financings (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 14,398	R$ 15,179
Shares [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,390
Without Guarantee [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	195
Financial guarantee contracts [member] | Promissory Notes And Sureties [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	8,850
Financial guarantee contracts [member] | Receivables [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	R$ 3,963

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
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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.

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