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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details) - BRL (R$) R$ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of trade and other receivables [line items]
Billed supply	R$ 3,130	R$ 2,989
Unbilled supply	1,204	1,048
Other concession holders - wholesale supply	47	47
Other concession holders - wholesale supply, unbilled	204	282
CCEE (Power Trading Chamber)	386	166
Concession Holders - power transport	187	180
Concession Holders - power transport, unbilled	253	212
Provision for doubtful receivables	(810)	(751)	R$ (568)	R$ (660)
Trade and other receivables	4,601	4,173
Current assets	4,524	4,092
Non-current assets	77	R$ 81
Balances Not Yet Due [Member]
Disclosure of trade and other receivables [line items]
Billed supply	1,396
Unbilled supply	1,204
Other concession holders - wholesale supply
Other concession holders - wholesale supply, unbilled	204
CCEE (Power Trading Chamber)
Concession Holders - power transport	80
Concession Holders - power transport, unbilled	253
Provision for doubtful receivables	(171)
Trade and other receivables	2,966
Not Later Than Three Months [Member]
Disclosure of trade and other receivables [line items]
Billed supply	707
Unbilled supply
Other concession holders - wholesale supply	32
Other concession holders - wholesale supply, unbilled
CCEE (Power Trading Chamber)
Concession Holders - power transport	20
Concession Holders - power transport, unbilled
Provision for doubtful receivables	(12)
Trade and other receivables	747
Later Than Three Months And Not Later Than One Year [Member]
Disclosure of trade and other receivables [line items]
Billed supply	431
Unbilled supply
Other concession holders - wholesale supply	15
Other concession holders - wholesale supply, unbilled
CCEE (Power Trading Chamber)	386
Concession Holders - power transport	6
Concession Holders - power transport, unbilled
Provision for doubtful receivables	(38)
Trade and other receivables	800
More Than One Year [member]
Disclosure of trade and other receivables [line items]
Billed supply	596
Unbilled supply
Other concession holders - wholesale supply
Other concession holders - wholesale supply, unbilled
CCEE (Power Trading Chamber)
Concession Holders - power transport	81
Concession Holders - power transport, unbilled
Provision for doubtful receivables	(589)
Trade and other receivables	R$ 88

X

- Definition

Billed supply.

+ References

No definition available.

+ Details

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X

- Definition

Concession holders power transport unbilled.

+ References

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X

- Definition

Concession holders transport of electricity.

+ References

No definition available.

+ Details

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X

- Definition

Current consumers and traders and concession holders transport of electricity.

+ References

No definition available.

+ Details

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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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X

- Definition

Noncurrent customers and traders and concession holders transport of electricity.

+ References

No definition available.

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X

- Definition

Unbilled supply.

+ References

No definition available.

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X

- Definition

Wholesale supply to other concession holders.

+ References

No definition available.

+ Details

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X

- Definition

Wholesale supply to other concession holders unbilled.

+ References

No definition available.

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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 2021-01-01
-Name IFRS
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-IssueDate 2019-01-01
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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 2019-01-01
-Paragraph 54
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
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