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Commitments - Schedule of Detailed Information About Contractual Obligations and Commitments (Details)
R$ in Millions
Dec. 31, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments R$ 180,075
Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 25,179
Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 82,705
Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 441
Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 8,761
Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,534
Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 45,177
Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 13,278
Not later than one year  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 13,269
Not later than one year | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,095
Not later than one year | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,187
Not later than one year | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 320
Not later than one year | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 383
Not later than one year | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 193
Not later than one year | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 6,352
Not later than one year | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 739
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 11,843
Later than one year and not later than two years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,095
Later than one year and not later than two years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,250
Later than one year and not later than two years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 101
Later than one year and not later than two years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 383
Later than one year and not later than two years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 217
Later than one year and not later than two years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 5,137
Later than one year and not later than two years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 660
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 11,050
Later than two years and not later than three years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,095
Later than two years and not later than three years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,438
Later than two years and not later than three years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 20
Later than two years and not later than three years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 385
Later than two years and not later than three years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 224
Later than two years and not later than three years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,306
Later than two years and not later than three years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 582
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 9,904
Later than three years and not later than four years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,095
Later than three years and not later than four years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,649
Later than three years and not later than four years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments
Later than three years and not later than four years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 386
Later than three years and not later than four years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 205
Later than three years and not later than four years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 2,987
Later than three years and not later than four years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 582
Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 9,738
Later than four years and not later than five years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,095
Later than four years and not later than five years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,694
Later than four years and not later than five years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments
Later than four years and not later than five years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 385
Later than four years and not later than five years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 186
Later than four years and not later than five years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 2,805
Later than four years and not later than five years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 573
Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 124,271
Later than five years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 19,704
Later than five years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 60,487
Later than five years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments
Later than five years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 6,839
Later than five years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 3,509
Later than five years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 23,590
Later than five years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments R$ 10,142