XML 130 R123.htm IDEA: XBRL DOCUMENT v3.8.0.1
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