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Operating Segments - Schedule of Operating Revenues, Costs and Expenses (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | R$ 42,239 | R$ 42,035 | R$ 40,857
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES | 7,792 | 8,753 | 9,745
ADDITIONS TO THE SEGMENT | 1,495 | 2,737 | 1,726
ADDITIONS TO FINANCIAL ASSETS | 25 | 2,271 | 146
NET REVENUE | 21,712 | 18,773 | 21,868
COST OF ELECTRICITY AND GAS |  |  |
Electricity for purchased for sale | (10,919) | (8,272) | (9,542)
Charges for the use of the national grid | (1,174) | (947) | (999)
Gas bought for resale | (1,071) | (877) | (1,051)
Operating costs | (13,164) | 10,096 | (11,592)
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (1,627) | (1,644) | (1,435)
Employees' and managers' profit sharing | (5) | (8) | (137)
Post-retirement liabilities | 229 | (345) | (156)
Materials | (61) | (58) | (154)
Raw materials and inputs for production of electricity | (10) |  |
Outsourced services | (974) | (867) | (899)
Depreciation and amortization | (850) | (835) | (835)
Operating provisions (reversals) | (854) | (713) | (1,401)
Construction costs | (1,119) | (1,193) | (1,252)
Other operating expenses, net | (383) | (145) | (426)
Total cost of operation | (5,654) | (5,808) | (6,695)
OPERATING COSTS AND EXPENSES | (18,818) | (15,904) | (18,287)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 2,894 | 2,869 | 3,581
Equity in earnings of unconsolidated investees, net | (252) | (302) | 393
Adjustment for loss of value in Investments |  | (763) |
Fair value results in Corporate Operation |  |  | 729
Finance income | 804 | 1,041 | 863
Finance expenses | (1,800) | (2,478) | (2,204)
Income before income tax and social contribution tax | 1,646 | 367 | 3,362
Income and Social Contribution taxes | (644) | (33) | (893)
NET INCOME (LOSS) FOR THE YEAR | 1,002 | 334 | 2,469
Items that will not be reclassified to profit or loss |  |  |
Post retirement liabilities - restatement of obligations of the defined benefit plans, net of taxes | (261) | (515) | (360)
Equity gain (loss) on Other comprehensive income in jointly-controlled entities | (3) | 4 | (1)
Other comprehensive income that will not be reclassified to profit or loss, net of tax | (264) | (511) | (361)
Items that may be reclassified to profit or loss |  |  |
Conversion adjustment of equity gain (loss) in other comprehensive income in subsidiary and jointly-controlled entity | (38) | (3) | 54
Items that may be reclassified to profit or loss | (38) | (43) | 54
Recycling of conversion adjustments to the Income statement arising from sale of Transchile |  | (39) |
COMPREHENSIVE INCOME FOR THE YEAR | 700 | (219) | 2,162
Controlling shareholders | 699 | (219) | 2,162
Non-controlling shareholder | 1 | 0 | 0
Eliminations [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | (32) | (276) | (976)
NET REVENUE | (288) | (234) | (268)
COST OF ELECTRICITY AND GAS |  |  |
Electricity for purchased for sale | 73 | 59 | 120
Charges for the use of the national grid | 181 | 134 | 112
Operating costs | 254 | 193 | 232
OPERATING COSTS AND EXPENSES |  |  |
Outsourced services | 30 | 37 | 31
Other operating expenses, net | 4 | 4 | 5
Total cost of operation | 34 | 41 | 36
OPERATING COSTS AND EXPENSES | 288 | 234 | 268
Electricity Generation [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 14,366 | 14,414 | 13,382
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES | 4,723 | 5,292 | 5,751
ADDITIONS TO THE SEGMENT | 308 | 916 | 577
ADDITIONS TO FINANCIAL ASSETS |  | 2,217 |
NET REVENUE | 7,190 | 5,875 | 7,047
COST OF ELECTRICITY AND GAS |  |  |
Electricity for purchased for sale | (4,209) | (3,071) | (2,669)
Charges for the use of the national grid | (353) | (321) | (297)
Operating costs | (4,562) | (3,392) | (2,966)
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (281) | (271) | (224)
Employees' and managers' profit sharing | (1) | (1) | (24)
Post-retirement liabilities | 39 | (54) | (21)
Materials | (11) | (11) | (95)
Raw materials and inputs for production of electricity | (10) |  |
Outsourced services | (127) | (129) | (143)
Depreciation and amortization | (176) | (202) | (273)
Operating provisions (reversals) | (139) | (88) | (109)
Other operating expenses, net | (117) | (57) | (62)
Total cost of operation | (823) | (813) | (951)
OPERATING COSTS AND EXPENSES | (5,385) | (4,205) | (3,917)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 1,805 | 1,670 | 3,130
Equity in earnings of unconsolidated investees, net | (519) | (448) | 17
Adjustment for loss of value in Investments |  | (763) |
Fair value results in Corporate Operation |  |  | 729
Finance income | 226 | 190 | 199
Finance expenses | (1,161) | (1,320) | (984)
Income before income tax and social contribution tax | 351 | (671) | 3,091
Income and Social Contribution taxes | (257) | (24) | (836)
NET INCOME (LOSS) FOR THE YEAR | 94 | (695) | 2,255
Items that will not be reclassified to profit or loss |  |  |
Post retirement liabilities - restatement of obligations of the defined benefit plans, net of taxes | (47) | (92) | (84)
Other comprehensive income that will not be reclassified to profit or loss, net of tax | (47) |  |
Items that may be reclassified to profit or loss |  |  |
Conversion adjustment of equity gain (loss) in other comprehensive income in subsidiary and jointly-controlled entity | (34) |  | 14
Items that may be reclassified to profit or loss | (34) |  |
COMPREHENSIVE INCOME FOR THE YEAR | 13 | (787) | 2,171
Controlling shareholders | 13 | (787) | 2,171
Electricity Transmission [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 3,955 | 4,267 | 4,880
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES | 1,122 | 1,670 | 2,423
ADDITIONS TO FINANCIAL ASSETS | 25 | 54 | 146
NET REVENUE | 777 | 1,113 | 519
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (106) | (111) | (113)
Employees' and managers' profit sharing |  |  | (12)
Post-retirement liabilities | 19 | (23) | (10)
Materials | (4) | (3) | (5)
Outsourced services | (31) | (30) | (37)
Operating provisions (reversals) | (10) | (10) | 2
Construction costs | (25) | (54) | (146)
Other operating expenses, net | (11) | (13) | (16)
Total cost of operation | (168) | (244) | (337)
OPERATING COSTS AND EXPENSES | (168) | (244) | (337)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 609 | 869 | 182
Equity in earnings of unconsolidated investees, net | 234 | 362 | 410
Finance income | 9 | 7 | 22
Finance expenses | (3) | (4) | (7)
Income before income tax and social contribution tax | 849 | 1,234 | 607
Income and Social Contribution taxes | (189) | 5 | (71)
NET INCOME (LOSS) FOR THE YEAR | 660 | 1,239 | 536
Items that will not be reclassified to profit or loss |  |  |
Post retirement liabilities - restatement of obligations of the defined benefit plans, net of taxes | (23) |  |
Other comprehensive income that will not be reclassified to profit or loss, net of tax | (23) |  |
Items that may be reclassified to profit or loss |  |  |
Recycling of conversion adjustments to the Income statement arising from sale of Transchile |  | (39) |
COMPREHENSIVE INCOME FOR THE YEAR | 637 | 1,200 | 536
Controlling shareholders | 637 | 1,200 | 536
Electricity Distribution [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 20,021 | 18,166 | 17,738
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES | 1,918 | 1,754 | 1,547
ADDITIONS TO THE SEGMENT | 1,083 | 1,602 | 1,044
NET REVENUE | 12,312 | 10,597 | 12,962
COST OF ELECTRICITY AND GAS |  |  |
Electricity for purchased for sale | (6,783) | (5,260) | (6,993)
Charges for the use of the national grid | (1,002) | (760) | (814)
Operating costs | (7,785) | (6,020) | (7,807)
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (1,123) | (1,147) | (1,000)
Employees' and managers' profit sharing | (3) | (10) | (95)
Post-retirement liabilities | 180 | (231) | (121)
Materials | (43) | (42) | (52)
Outsourced services | (785) | (674) | (697)
Depreciation and amortization | (567) | (525) | (444)
Operating provisions (reversals) | (469) | (544) | (209)
Construction costs | (1,045) | (1,102) | (1,044)
Other operating expenses, net | (408) | (395) | (283)
Total cost of operation | (4,263) | (4,670) | (3,945)
OPERATING COSTS AND EXPENSES | (12,048) | (10,690) | (11,752)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 264 | (93) | 1,210
Equity in earnings of unconsolidated investees, net | 42 | (180) | (6)
Finance income | 397 | 743 | 543
Finance expenses | (815) | (1,078) | (1,130)
Income before income tax and social contribution tax | (112) | (608) | 617
Income and Social Contribution taxes | 31 | 103 | (256)
NET INCOME (LOSS) FOR THE YEAR | (81) | (505) | 361
Items that will not be reclassified to profit or loss |  |  |
Post retirement liabilities - restatement of obligations of the defined benefit plans, net of taxes | (145) | (380) | (170)
Other comprehensive income that will not be reclassified to profit or loss, net of tax | (145) |  |
Items that may be reclassified to profit or loss |  |  |
COMPREHENSIVE INCOME FOR THE YEAR | (226) | (885) | 194
Controlling shareholders | (226) | (885) | 194
Telecoms [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 347 | 338 | 317
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES |  | 18 |
ADDITIONS TO THE SEGMENT | 47 | 163 | 42
NET REVENUE | 127 | 125 | 123
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (20) | (23) | (15)
Employees' and managers' profit sharing |  | (1) | (2)
Outsourced services | (28) | (23) | (25)
Depreciation and amortization | (35) | (38) | (49)
Operating provisions (reversals) | (1) | (4) | (1)
Other operating expenses, net | (23) | 11 | (20)
Total cost of operation | (107) | (78) | (112)
OPERATING COSTS AND EXPENSES | (107) | (78) | (112)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 20 | 47 | 11
Equity in earnings of unconsolidated investees, net | (2) | (31) | (28)
Finance income | 3 | 4 | 4
Finance expenses | (15) | (9) | (6)
Income before income tax and social contribution tax | 6 | 11 | (19)
Income and Social Contribution taxes | (3) | (6) | (16)
NET INCOME (LOSS) FOR THE YEAR | 3 | 5 | (35)
Items that may be reclassified to profit or loss |  |  |
COMPREHENSIVE INCOME FOR THE YEAR | 3 | 5 | (35)
Controlling shareholders | 3 | 5 | (35)
Gas [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 2,000 | 2,737 | 2,530
ADDITIONS TO THE SEGMENT | 56 | 56 | 62
NET REVENUE | 1,482 | 1,181 | 1,395
COST OF ELECTRICITY AND GAS |  |  |
Gas bought for resale | (1,071) | (877) | (1,051)
Operating costs | (1,071) | (877) | (1,051)
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (56) | (47) | (43)
Materials | (2) | (2) | (2)
Outsourced services | (17) | (16) | (15)
Depreciation and amortization | (71) | (54) | (54)
Operating provisions (reversals) | (2) |  |
Construction costs | (49) | (37) | (62)
Other operating expenses, net | (15) | (8) | (9)
Total cost of operation | (212) | (164) | (185)
OPERATING COSTS AND EXPENSES | (1,283) | (1,041) | (1,236)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | 199 | 140 | 159
Finance income | 49 | 15 | 23
Finance expenses | (43) | (49) | (42)
Income before income tax and social contribution tax | 205 | 106 | 140
Income and Social Contribution taxes | (71) | (8) | (23)
NET INCOME (LOSS) FOR THE YEAR | 134 | 98 | 117
Items that may be reclassified to profit or loss |  |  |
COMPREHENSIVE INCOME FOR THE YEAR | 134 | 98 | 117
Controlling shareholders | 133 | 98 | 117
Non-controlling shareholder | 1 |  |
Other [member] | Operating Segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
SEGMENT ASSETS | 1,582 | 2,389 | 2,986
INVESTMENTS IN ASSOCIATES AND JOINTLY-CONTROLLED ENTITIES | 29 | 19 | 24
ADDITIONS TO THE SEGMENT | 1 |  | 1
NET REVENUE | 112 | 116 | 90
OPERATING COSTS AND EXPENSES |  |  |
Personnel | (41) | (45) | (40)
Employees' and managers' profit sharing | (1) | 4 | (4)
Post-retirement liabilities | (9) | (37) | (4)
Materials | (1) |  |
Outsourced services | (16) | (32) | (13)
Depreciation and amortization | (1) | (16) | (15)
Operating provisions (reversals) | (233) | (67) | (1,084)
Other operating expenses, net | 187 | 313 | (42)
Total cost of operation | (115) | 120 | (1,202)
OPERATING COSTS AND EXPENSES | (115) | 120 | (1,202)
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES) | (3) | 236 | (1,112)
Equity in earnings of unconsolidated investees, net | (7) | (5) |
Finance income | 120 | 82 | 73
Finance expenses | 237 | (18) | (35)
Income before income tax and social contribution tax | 347 | 295 | (1,074)
Income and Social Contribution taxes | (155) | (103) | 309
NET INCOME (LOSS) FOR THE YEAR | 192 | 192 | (765)
Items that will not be reclassified to profit or loss |  |  |
Post retirement liabilities - restatement of obligations of the defined benefit plans, net of taxes | (46) | (43) | (106)
Equity gain (loss) on Other comprehensive income in jointly-controlled entities | (3) | 4 | (1)
Other comprehensive income that will not be reclassified to profit or loss, net of tax | (49) |  |
Items that may be reclassified to profit or loss |  |  |
Conversion adjustment of equity gain (loss) in other comprehensive income in subsidiary and jointly-controlled entity | (4) | (3) | 40
Items that may be reclassified to profit or loss | (4) |  |
COMPREHENSIVE INCOME FOR THE YEAR | 139 | 150 | (821)
Controlling shareholders | R$ 139 | R$ 150 | R$ (821)

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