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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Summary of Effects on Cash Flow Arising From Disposal of Telecom Assets (Detail) - Telecom assets [member] R$ in Millions	12 Months Ended
	Dec. 31, 2018 BRL (R$)
Disclosure of cash flows from discontinued operations [line items]
Operational activity - gain on sale of investment	R$ (378)
Investment activity - amount of sale	655
Increase (decrease) in cash and cash equivalents, discontinued operations, Total	R$ 277

X

- Definition

The cash flows from (used in) the entity's investing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) investing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2018-01-01
-Paragraph 33
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2018-03-01&anchor=para_33_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The cash flows from (used in) the entity's operating activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) operating activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2018-01-01
-Paragraph 33
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2018-03-01&anchor=para_33_c&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The increase (decrease) in cash and cash equivalents from discontinued operations. [Refer: Cash and cash equivalents; Discontinued operations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 5
-IssueDate 2018-01-01
-Paragraph 33
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2018-03-01&anchor=para_33_c&doctype=Standard
-URIDate 2018-03-16

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Disclosure of cash flows from discontinued operations.

+ References

No definition available.

+ Details

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