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Financial Instruments and Risk Management - Estimation of Company Interest Rate (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets |  |  |  |  |
Short-term investments |  | R$ 917 | R$ 894 |  |
Securities |  | 1,088 | 1,045 |  |
Advance for future delivery of energy supply |  | 8,537 | 8,286 |  |
Restricted cash |  | 106 | 367 |  |
CVA and Other financial components in tariff adjustments - Selic rate |  | 7,453 | 5,701 |  |
Total assets |  | 42,240 | 42,036 |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) |  | (14,398) | (15,179) |  |
Advance sales of energy supply-CDI (Note 8) |  | (8,663) | (11,447) |  |
Liabilities |  | (27,910) | (29,102) |  |
Net assets (liabilities) exposed |  | (46) | (407) | R$ 1,350 | R$ 1,107
Renova [member] |  |  |  |  |
Assets |  |  |  |  |
Advance for future delivery of energy supply |  | 32 | 136 | 551 |
Total assets |  | 1,711 | 5,901 | 8,976 |
Liabilities |  |  |  |  |
Advance sales of energy supply-CDI (Note 8) |  | (395) | (3,347) | (1,497) |
Liabilities |  | (1,711) | (5,901) | R$ (8,976) |
Book value [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate |  | 4,376 |  |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) |  | (4,805) |  |  |
Net assets (liabilities) exposed |  | (429) |  |  |
Interest rate risk [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate |  | 4,376 | 4,187 |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) |  | (4,805) | R$ (4,722) |  |
Interest rate risk [member] | Probable scenario 1 [member] |  |  |  |  |
Assets |  |  |  |  |
Short-term investments | R$ 979 |  |  |  |
Securities | 1,162 |  |  |  |
Advance for future delivery of energy supply | 131 |  |  |  |
Total assets | 4,315 |  |  |  |
Liabilities |  |  |  |  |
Advance sales of energy supply-CDI (Note 8) | (201) |  |  |  |
Adherence to Tax Anmesty Program (PRCT) (Note 20) | (302) |  |  |  |
Liabilities | (8,762) |  |  |  |
Net assets (liabilities) exposed | (4,447) |  |  |  |
Net effect of variation in interest rates | (281) |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate | 394 |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | Eletrobras [member] |  |  |  |  |
Assets |  |  |  |  |
Credits owed by Eletrobras | 5 |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
Receivable for residual value - Generation - SELIC (Note 15) | 1,157 |  |  |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) | (443) |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | CDI rate[member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (7,689) |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | TJLP [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (127) |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | Renova [member] |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable - Renova (Note 29) | 374 |  |  |  |
Interest rate risk [member] | Probable scenario 1 [member] | Advance For Future Delivery Of Energy Supply [Member] |  |  |  |  |
Assets |  |  |  |  |
Restricted cash | 113 |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] |  |  |  |  |
Assets |  |  |  |  |
Short-term investments | 994 |  |  |  |
Securities | 1,180 |  |  |  |
Advance for future delivery of energy supply | 133 |  |  |  |
Total assets | 4,382 |  |  |  |
Liabilities |  |  |  |  |
Advance sales of energy supply-CDI (Note 8) | (204) |  |  |  |
Adherence to Tax Anmesty Program (PRCT) (Note 20) | (307) |  |  |  |
Liabilities | (8,900) |  |  |  |
Net assets (liabilities) exposed | (4,518) |  |  |  |
Net effect of variation in interest rates | (352) |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate | 400 |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | Eletrobras [member] |  |  |  |  |
Assets |  |  |  |  |
Credits owed by Eletrobras | 5 |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
Receivable for residual value - Generation - SELIC (Note 15) | 1,175 |  |  |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) | (450) |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | CDI rate[member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (7,810) |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | TJLP [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (129) |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | Renova [member] |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable - Renova (Note 29) | 380 |  |  |  |
Interest rate risk [member] | Probable scenario 2 [Member] | Advance For Future Delivery Of Energy Supply [Member] |  |  |  |  |
Assets |  |  |  |  |
Restricted cash | 115 |  |  |  |
Interest rate risk [member] | Scenario 3 [member] |  |  |  |  |
Assets |  |  |  |  |
Short-term investments | 1,010 |  |  |  |
Securities | 1,198 |  |  |  |
Advance for future delivery of energy supply | 135 |  |  |  |
Total assets | 4,451 |  |  |  |
Liabilities |  |  |  |  |
Advance sales of energy supply-CDI (Note 8) | (207) |  |  |  |
Adherence to Tax Anmesty Program (PRCT) (Note 20) | (312) |  |  |  |
Liabilities | (9,039) |  |  |  |
Net assets (liabilities) exposed | (4,588) |  |  |  |
Net effect of variation in interest rates | (422) |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate | 406 |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | Eletrobras [member] |  |  |  |  |
Assets |  |  |  |  |
Credits owed by Eletrobras | 5 |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
Receivable for residual value - Generation - SELIC (Note 15) | 1,194 |  |  |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) | (457) |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | CDI rate[member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (7,932) |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | TJLP [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) | (131) |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | Renova [member] |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable - Renova (Note 29) | 386 |  |  |  |
Interest rate risk [member] | Scenario 3 [member] | Advance For Future Delivery Of Energy Supply [Member] |  |  |  |  |
Assets |  |  |  |  |
Restricted cash | R$ 117 |  |  |  |
Interest rate risk [member] | Book value [member] |  |  |  |  |
Assets |  |  |  |  |
Short-term investments |  | 917 |  |  |
Securities |  | 1,088 |  |  |
Advance for future delivery of energy supply |  | 123 |  |  |
Total assets |  | 4,041 |  |  |
Liabilities |  |  |  |  |
Advance sales of energy supply-CDI (Note 8) |  | (188) |  |  |
Adherence to Tax Anmesty Program (PRCT) (Note 20) |  | (283) |  |  |
Liabilities |  | (8,207) |  |  |
Net assets (liabilities) exposed |  | (4,166) |  |  |
Interest rate risk [member] | Book value [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
CVA and Other financial components in tariff adjustments - Selic rate |  | 369 |  |  |
Interest rate risk [member] | Book value [member] | Eletrobras [member] |  |  |  |  |
Assets |  |  |  |  |
Credits owed by Eletrobras |  | 4 |  |  |
Interest rate risk [member] | Book value [member] | Selic rate [member] |  |  |  |  |
Assets |  |  |  |  |
Receivable for residual value - Generation - SELIC (Note 15) |  | 1,084 |  |  |
Liabilities |  |  |  |  |
CVA and Other Financial components in tariffs (Note 15) |  | (415) |  |  |
Interest rate risk [member] | Book value [member] | CDI rate[member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) |  | (7,202) |  |  |
Interest rate risk [member] | Book value [member] | TJLP [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and financings - CDI (Note 21) |  | (119) |  |  |
Interest rate risk [member] | Book value [member] | Renova [member] |  |  |  |  |
Assets |  |  |  |  |
Accounts receivable - Renova (Note 29) |  | 350 |  |  |
Interest rate risk [member] | Book value [member] | Advance For Future Delivery Of Energy Supply [Member] |  |  |  |  |
Assets |  |  |  |  |
Restricted cash |  | R$ 106 |  |  |

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