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Property, Plant and Equipment - Summary of Movement in Property, Plant and Equipment (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | R$ 3,775 | R$ 3,940 | R$ 5,544
Addition | 83 | 120 | 126
Jaguara, Miranda and Volta Grande Plants | (876) |  |
Disposal | (27) | (56) | (20)
Transfer of assets to Alianca Geracao de Energia |  |  | (631)
Indemnity receivable |  |  | (546)
Depreciation | (205) | (234) | (315)
Transfers to other long term assets |  |  | (223)
Transfers / capitalizations | 12 | 5 | 5
Property plant and equipment, Ending balance | 2,762 | 3,775 | 3,940
Investment Property Completed [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 3,637 | 3,750 | 5,309
Jaguara, Miranda and Volta Grande Plants | (876) |  |
Disposal | (10) | (43) | (16)
Transfer of assets to Alianca Geracao de Energia |  |  | (628)
Indemnity receivable |  |  | (545)
Depreciation | (205) | (234) | (314)
Transfers to other long term assets |  |  | (201)
Transfers / capitalizations | 110 | 164 | 145
Property plant and equipment, Ending balance | 2,656 | 3,637 | 3,750
Investment Property Completed [member] | Land [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 279 | 279 | 372
Jaguara, Miranda and Volta Grande Plants | (61) |  |
Disposal | (1) |  | (12)
Transfer of assets to Alianca Geracao de Energia |  |  | (41)
Indemnity receivable |  |  | (16)
Depreciation | (6) |  | (3)
Transfers to other long term assets |  |  | (17)
Transfers / capitalizations |  |  | (4)
Property plant and equipment, Ending balance | 211 | 279 | 279
Investment Property Completed [member] | Reservoirs Dams And Water Courses [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 1,761 | 1,830 | 2,261
Jaguara, Miranda and Volta Grande Plants | (441) |  |
Disposal | (4) |  |
Transfer of assets to Alianca Geracao de Energia |  |  | (163)
Indemnity receivable |  |  | (46)
Depreciation | (85) | (99) | (127)
Transfers to other long term assets |  |  | (102)
Transfers / capitalizations | 3 | 30 | 7
Property plant and equipment, Ending balance | 1,234 | 1,761 | 1,830
Investment Property Completed [member] | Buildings Works And Improvements [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 418 | 437 | 609
Jaguara, Miranda and Volta Grande Plants | (69) |  |
Disposal |  | (1) | (1)
Transfer of assets to Alianca Geracao de Energia |  |  | (116)
Indemnity receivable |  |  | (17)
Depreciation | (20) | (23) | (32)
Transfers to other long term assets |  |  | (13)
Transfers / capitalizations | 2 | 5 | 7
Property plant and equipment, Ending balance | 331 | 418 | 437
Investment Property Completed [member] | Machinery And Equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 1,172 | 1,192 | 2,053
Jaguara, Miranda and Volta Grande Plants | (305) |  |
Disposal | (5) | (42) | (3)
Transfer of assets to Alianca Geracao de Energia |  |  | (308)
Indemnity receivable |  |  | (466)
Depreciation | (93) | (110) | (149)
Transfers to other long term assets |  |  | (69)
Transfers / capitalizations | 105 | 132 | 134
Property plant and equipment, Ending balance | 874 | 1,172 | 1,192
Investment Property Completed [member] | Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 4 | 8 | 9
Depreciation | (1) | (2) | (3)
Transfers / capitalizations |  | (2) | 2
Property plant and equipment, Ending balance | 3 | 4 | 8
Investment Property Completed [member] | Fixtures And Fittings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 3 | 4 | 5
Transfers / capitalizations |  | (1) | (1)
Property plant and equipment, Ending balance | 3 | 3 | 4
Investment Property In Progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property plant and equipment, Beginning balance | 138 | 190 | 235
Addition | 83 | 120 | 126
Disposal | (17) | (13) | (4)
Transfer of assets to Alianca Geracao de Energia |  |  | (3)
Indemnity receivable |  |  | (1)
Depreciation |  |  | (1)
Transfers to other long term assets |  |  | (22)
Transfers / capitalizations | (98) | (159) | (140)
Property plant and equipment, Ending balance | R$ 106 | R$ 138 | R$ 190

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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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