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Customers, Traders and Power Transport Concession Holders - Summary of Trade and Other Receivables (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of trade and other receivables [Line Items]
Billed supply	R$ 2,687	R$ 2,568
Unbilled supply	994	920
Other concession holders - wholesale supply	26	80
Other concession holders - wholesale supply, unbilled	283	343
CCEE (Wholesale Trading Exchange)	382	1
Concession Holders - power transport	159	124
Concession Holders - power transport, unbilled	177	195
(-) Provision for doubtful receivables	(568)	(660)	R$ (625)	R$ (650)
Trade and other receivables	4,140	3,571
Current assets	3,885	3,425
Non-current assets	255	R$ 146
Balances not yet due [member]
Disclosure of trade and other receivables [Line Items]
Billed supply	1,309
Unbilled supply	994
Other concession holders - wholesale supply	9
Other concession holders - wholesale supply, unbilled	283
CCEE (Wholesale Trading Exchange)	255
Concession Holders - power transport	75
Concession Holders - power transport, unbilled	177
Trade and other receivables	3,102
Up to 90 days past due [member]
Disclosure of trade and other receivables [Line Items]
Billed supply	698
Other concession holders - wholesale supply	21
CCEE (Wholesale Trading Exchange)	119
Concession Holders - power transport	5
Trade and other receivables	843
More than 90 days past due [member]
Disclosure of trade and other receivables [Line Items]
Billed supply	680
Other concession holders - wholesale supply	(4)
CCEE (Wholesale Trading Exchange)	8
Concession Holders - power transport	79
(-) Provision for doubtful receivables	(568)
Trade and other receivables	R$ 195

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B
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X

- Definition

The amount of trade receivables and other receivables. [Refer: Trade receivables; Other receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_h&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

Billed supply.

+ References

No definition available.

+ Details

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X

- Definition

Concession holders power transport unbilled.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Concession holders transport of electricity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Current consumers and traders and concession holders transport of electricity.

+ References

No definition available.

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X

- Definition

Disclosure of trade and other receivables.

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X

- Definition

Electricity wholesale trading exchange receivables.

+ References

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- Definition

Noncurrent customers and traders and concession holders transport of electricity.

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X

- Definition

Unbilled supply.

+ References

No definition available.

+ Details

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X

- Definition

Wholesale supply to other concession holders.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Wholesale supply to other concession holders unbilled.

+ References

No definition available.

+ Details

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