XML 153 R146.htm IDEA: XBRL DOCUMENT v3.19.1
Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ 2,662 R$ 2,762 R$ 3,775 R$ 3,940
Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2,542 2,656 3,637 3,750
Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 215 211 279 279
Investment Property Completed [member] | Reservoirs Dams And Water Courses [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 1,150 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]        
Net PP&E 314 331 418 437
Investment Property Completed [member] | Machinery And Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 854 874 1,172 1,192
Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 5 3 4 8
Investment Property Completed [member] | Furniture and fixtures [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 4 3 3 4
Investment Property In Progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 120 106 R$ 138 R$ 190
Gross Carrying Amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,568 7,714    
Gross Carrying Amount [member] | Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,448 7,608    
Gross Carrying Amount [member] | Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 231 225    
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 3,282 3,285    
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 1,114 1,117    
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 2,773 2,936    
Gross Carrying Amount [member] | Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 32 29    
Gross Carrying Amount [member] | Investment Property Completed [member] | Furniture and fixtures [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 16 16    
Gross Carrying Amount [member] | Investment Property In Progress [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 120 106    
Accumulated amortization [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,906) (4,952)    
Accumulated amortization [member] | Investment Property Completed [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,906) (4,952)    
Accumulated amortization [member] | Investment Property Completed [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (16) (14)    
Accumulated amortization [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 (2,132) (2,051)    
Accumulated amortization [member] | Investment Property Completed [member] | Buildings Works And Improvements [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (800) (786)    
Accumulated amortization [member] | Investment Property Completed [member] | Machinery And Equipment [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (1,919) (2,062)    
Accumulated amortization [member] | Investment Property Completed [member] | Vehicles [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (27) (26)    
Accumulated amortization [member] | Investment Property Completed [member] | Furniture and fixtures [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ (12) R$ (13)