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Property, Plant and Equipment - Schedule of Movement in Property, Plant and Equipment (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Net PP&E R$ 3,256 R$ 2,410  
Property plant and equipment, Beginning balance 2,410    
Depreciation (170) (172) R$ (171)
Property plant and equipment, Ending balance 3,256 2,410  
Disposals - Assets classified as held for sale (58) (12) (15)
Additions 1,006 [1] 176 182
Business Combination 70    
Property plant and equipment, Beginning balance 2,411 2,419 2,407
Property plant and equipment, Ending balance 3,256 2,411 2,419
Reversal of provision (3)   43
Write off [2]     16
Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 2,049 2,031  
Property plant and equipment, Beginning balance 2,031 2,113 2,230
Depreciation (170) (172) (171)
Property plant and equipment, Ending balance 2,049 2,031 2,113
Transfers / Capitalizations 176 102 69
Disposals - Assets classified as held for sale (58) (12) (15)
Additions [1] 1    
Business Combination 70    
Reversal of provision (1)   43
Investment property under construction or development [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 1,207 379  
Property plant and equipment, Beginning balance 380 306 177
Property plant and equipment, Ending balance 1,207 380 306
Transfers / Capitalizations (176) (102) (69)
Additions 1,005 [1] 176 182
Reversal of provision (2)    
Write off [2]     16
Land [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 214 217  
Property plant and equipment, Beginning balance 217 [3],[4] 220 [3],[5] 224 [5]
Depreciation (3) [4] (3) [3] (3) [5]
Property plant and equipment, Ending balance 214 [4] 217 [3],[4] 220 [3],[5]
Transfers / Capitalizations [4] 2    
Disposals - Assets classified as held for sale (2) [4]   (1) [5]
Reservoirs, dams and watercourses [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 853 870  
Property plant and equipment, Beginning balance 870 944 1,020
Depreciation (79) (81) (81)
Property plant and equipment, Ending balance 853 870 944
Transfers / Capitalizations 84 7 5
Disposals - Assets classified as held for sale (22)    
Buildings Works and Improvements [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 227 233  
Property plant and equipment, Beginning balance 233 248 264
Depreciation (17) (17) (17)
Property plant and equipment, Ending balance 227 233 248
Transfers / Capitalizations 16 2 1
Disposals - Assets classified as held for sale (5)    
Machinery and equipment [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 748 706  
Property plant and equipment, Beginning balance 706 697 717
Depreciation (69) (70) (69)
Property plant and equipment, Ending balance 748 706 697
Transfers / Capitalizations 70 91 63
Disposals - Assets classified as held for sale (29) (12) (14)
Additions [1] 1    
Business Combination 70    
Reversal of provision (1)   43
Vehicle [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 4 2  
Property plant and equipment, Beginning balance 2 1 2
Depreciation (2) (1) (1)
Property plant and equipment, Ending balance 4 2 1
Transfers / Capitalizations 4 2  
Furniture and utensils [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 3 3  
Property plant and equipment, Beginning balance 3 3 3
Property plant and equipment, Ending balance 3 3 R$ 3
Gross carrying amount [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 8,731 7,815  
Gross carrying amount [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 7,524 7,436  
Gross carrying amount [member] | Investment property under construction or development [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 1,207 379  
Gross carrying amount [member] | Land [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 247 247  
Gross carrying amount [member] | Reservoirs, dams and watercourses [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 3,323 3,303  
Gross carrying amount [member] | Buildings Works and Improvements [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 1,095 1,092  
Gross carrying amount [member] | Machinery and equipment [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 2,826 2,765  
Gross carrying amount [member] | Vehicle [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 19 15  
Gross carrying amount [member] | Furniture and utensils [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E 14 14  
Accumulated depreciation and amortisation [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (5,475) (5,405)  
Accumulated depreciation and amortisation [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (5,475) (5,405)  
Accumulated depreciation and amortisation [member] | Land [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (33) (30)  
Accumulated depreciation and amortisation [member] | Reservoirs, dams and watercourses [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (2,470) (2,433)  
Accumulated depreciation and amortisation [member] | Buildings Works and Improvements [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (868) (859)  
Accumulated depreciation and amortisation [member] | Machinery and equipment [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (2,078) (2,059)  
Accumulated depreciation and amortisation [member] | Vehicle [Member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E (15) (13)  
Accumulated depreciation and amortisation [member] | Furniture and utensils [member] | Investment property completed [member]      
IfrsStatementLineItems [Line Items]      
Net PP&E R$ (11) R$ (11)  
[1] This includes investments in the Boa Esperança and Jusante photovoltaic solar plants – respectively of R$369 and R$339.
[2] Reversal of a provision previously recognized for impairment of works in progress assets.
[3] Certain land linked to concession agreements with no indemnity provision is amortized over the concession period.
[4] Certain land linked to concession agreements with no indemnity provision is depreciated over the concession period.
[5] Certain land sites linked to concession contracts and without provision for reimbursement are amortized in accordance with the period of the concession.