XML 89 R82.htm IDEA: XBRL DOCUMENT v3.8.0.1
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)