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17. PROPERTY, PLANT AND EQUIPMENT (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance R$ 2,450 [1] R$ 2,662 R$ 2,762
Additions 132 70  
Jaguara, Miranda and Volta Grande Plants     77
Disposals [2] 8 (103) (33)
Depreciation (181) (183) (175)
Transfer to Held for sale     (256)
Adjustment for business combination     296
Transfers / capitalizations (2) [3] 4 [4] (9) [3]
Property plant and equipment, Ending balance 2,407 2,450 [1] 2,662
Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 2,317 2,542 2,656
Additions 20    
Jaguara, Miranda and Volta Grande Plants    
Disposals [2] (3) (91) (11)
Depreciation (181) (183) (175)
Transfer to Held for sale     (256)
Adjustment for business combination     296
Transfers / capitalizations 77 [3] 49 [4] 32 [3]
Property plant and equipment, Ending balance 2,230 2,317 2,542
Investment property under construction or sevelopment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 133 120 106
Additions 112 70  
Jaguara, Miranda and Volta Grande Plants     77
Disposals [2] 11 (12) (22)
Depreciation  
Transfers / capitalizations (79) [3] (45) [4] (41) [3]
Property plant and equipment, Ending balance 177 133 120
Land [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 229 [4],[5] 215 [4] 211
Additions [4]
Disposals [2] (1) [4]
Depreciation (4) (3) [4] (2)
Transfer to Held for sale    
Adjustment for business combination    
Transfers / capitalizations [3] 17 [4] 6 [3]
Property plant and equipment, Ending balance 224 229 [4],[5] 215 [4]
Reservoirs, dams and watercourses [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 1,080 1,150 1,234
Additions  
Jaguara, Miranda and Volta Grande Plants    
Disposals [2] (4) (2)
Depreciation (80) (80) (82)
Transfer to Held for sale    
Adjustment for business combination    
Transfers / capitalizations 20 [3] 14 [4] [3]
Property plant and equipment, Ending balance 1,020 1,080 1,150
Buildings works and improvements [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 274 314 331
Additions  
Jaguara, Miranda and Volta Grande Plants    
Disposals [2] (5)
Depreciation (18) (19) (19)
Transfer to Held for sale    
Adjustment for business combination    
Transfers / capitalizations 8 [3] (16) [4] 2 [3]
Property plant and equipment, Ending balance 264 274 314
Machinery and equipment [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 729 854 874
Additions 20  
Jaguara, Miranda and Volta Grande Plants    
Disposals [2] (2) (81) (9)
Depreciation (79) (78) (70)
Transfer to Held for sale     (256)
Adjustment for business combination     296
Transfers / capitalizations 49 [3] 34 [4] 19 [3]
Property plant and equipment, Ending balance 717 729 854
Vehicles [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 2 5 3
Additions  
Jaguara, Miranda and Volta Grande Plants    
Disposals [2]  
Depreciation (3) (2)
Transfer to Held for sale    
Adjustment for business combination    
Transfers / capitalizations [3] [4] 4 [3]
Property plant and equipment, Ending balance 2 2 5
Furniture and utensils [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance 3 4 3
Additions    
Jaguara, Miranda and Volta Grande Plants    
Disposals [2]  
Depreciation  
Transfer to Held for sale    
Adjustment for business combination    
Transfers / capitalizations [3]   1
Property plant and equipment, Ending balance 3 3 4
Furniture and utensils [member] | Investment property completed [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment, Beginning balance R$ 3 4  
Additions    
Disposals [2]   (1)  
Depreciation    
Transfers / capitalizations [4]    
Property plant and equipment, Ending balance   R$ 3 R$ 4
[1] See note 2.8.
[2] Includes the impairment loss recognized for assets in progress.
[3] Balances of R$2 were transferred to Intangible assets from PP&E.
[4] Balances of R$4 were transferred between Intangible assets, concession contract assets and PP&E.
[5] Certain land sites linked to concession contracts and without provision for reimbursement are amortized in accordance with the period of the concession.