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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 |  |  |

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