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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Bank accounts	R$ 108	R$ 113
Cash equivalents
Bank certificates of deposit (CDBs)	555	686
Overnight	228	227
Others		4
Short term investments	783	917
Cash and cash equivalents	R$ 891	R$ 1,030

X

- Definition

The amount of cash balances held at banks.

+ References

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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- Definition

The amount of cash and cash equivalents that the entity does not separately disclose in the same statement or note. [Refer: Cash and cash equivalents]

+ References

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Overnight market classified as cash and cash equivalents.

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