XML 129 R122.htm IDEA: XBRL DOCUMENT v3.8.0.1
Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ 2,762 R$ 3,775 R$ 3,940 R$ 5,544
Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2,656 3,637 3,750 5,309
Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 211 279 279 372
Investment Property Completed [member] | Reservoirs Dams And Water Courses [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 1,234 1,761 1,830 2,261
Investment Property Completed [member] | Buildings Works And Improvements [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 331 418 437 609
Investment Property Completed [member] | Machinery And Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 874 1,172 1,192 2,053
Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 3 4 8 9
Investment Property Completed [member] | Fixtures And Fittings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 3 3 4 5
Investment Property In Progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 106 138 R$ 190 R$ 235
Gross Carrying Amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,714 12,124    
Gross Carrying Amount [member] | Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,608 11,986    
Gross Carrying Amount [member] | Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 225 287    
Gross Carrying Amount [member] | Investment Property Completed [member] | Reservoirs Dams And Water Courses [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 3,285 5,347    
Gross Carrying Amount [member] | Investment Property Completed [member] | Buildings Works And Improvements [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 1,117 1,789    
Gross Carrying Amount [member] | Investment Property Completed [member] | Machinery And Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2,936 4,519    
Gross Carrying Amount [member] | Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 29 29    
Gross Carrying Amount [member] | Investment Property Completed [member] | Fixtures And Fittings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 16 15    
Gross Carrying Amount [member] | Investment Property In Progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 106 138    
Accumulated Depreciation and Amortisation [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,952) (8,349)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,952) (8,349)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (14) (8)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Reservoirs Dams And Water Courses [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (2,051) (3,586)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Buildings Works And Improvements [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (786) (1,371)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Machinery And Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (2,062) (3,347)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (26) (25)    
Accumulated Depreciation and Amortisation [member] | Investment Property Completed [member] | Fixtures And Fittings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ (13) R$ (12)