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Concession Financial Assets and Liabilities - Summary of Changes in Concession Financial Assets (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial assets [line items] |  |  |
Additions | R$ 25 | R$ 2,271 | R$ 146
Transfers |  | (165) |
Amounts received | (234) | (314) |
Monetary updating | 317 | 352 |
Adjustment of BRR of Transmission Assets (Note 26) | (149) |  |
Infrastructure [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Beginning Balance | 5,303 | 2,184 | 7,216
Additions | 25 | 55 | 146
Transfers of indemnity - plants not renewed | 1,082 |  |
Addition - Grant Fee - Plants |  | 2,216 |
Disposals | (2) | (3) | (37)
Transfer from Financial assets to Intangible assets on renewal of concessions |  |  | (7,162)
Transfers |  |  | 806
Generation residual value receivable |  |  | 546
Amounts received | (496) | (331) | (10)
Transfers between PP&E, Financial assets and Intangible Assets | 148 | 71 |
Monetary updating | 541 | 751 |
Updating of the Concession Grant Fee |  | 352 |
Adjustment of expectation of cash flow from the Concession financial assets | 63 | 8 | 578
Updating of residual value of assets |  |  | 101
Adjustment of BRR of Transmission Assets (Note 26) | 149 |  |
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating | 271 |  |
Ending Balance | 7,084 | 5,303 | 2,184
Infrastructure [Member] | Transmission [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Beginning Balance | 2,287 | 1,501 | 1,272
Additions | 25 | 54 | 146
Disposals | (2) | (3) | (6)
Transfers |  |  | (2)
Amounts received | (264) | (16) | (10)
Transfers between PP&E, Financial assets and Intangible Assets | 2 |  |
Monetary updating | 224 | 751 |
Adjustment of expectation of cash flow from the Concession financial assets | 54 |  |
Updating of residual value of assets |  |  | 101
Adjustment of BRR of Transmission Assets (Note 26) | 149 |  |
Ending Balance | 2,475 | 2,287 | 1,501
Infrastructure [Member] | Generation [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Beginning Balance | 2,800 | 546 |
Additions |  | 1 |
Transfers of indemnity - plants not renewed | 1,082 |  |
Addition - Grant Fee - Plants |  | 2,216 |
Generation residual value receivable |  |  | 546
Amounts received | (232) | (315) |
Monetary updating | 317 |  |
Updating of the Concession Grant Fee |  | 352 |
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating | 271 |  |
Ending Balance | 4,238 | 2,800 | 546
Infrastructure [Member] | Distribution [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Beginning Balance | 216 | 137 | 5,944
Disposals |  |  | (31)
Transfer from Financial assets to Intangible assets on renewal of concessions |  |  | (7,162)
Transfers |  |  | 808
Transfers between PP&E, Financial assets and Intangible Assets | 146 | 71 |
Adjustment of expectation of cash flow from the Concession financial assets | 9 | 8 | 578
Ending Balance | R$ 371 | R$ 216 | R$ 137

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