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Commitments - Schedule of Detailed Information About Contractual Obligations and Commitments (Details)
R$ in Millions
Dec. 31, 2023
BRL (R$)
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments R$ 187,050
Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 26,307
Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 83,115
Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 929
Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 9,146
Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 5,852
Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 47,609
Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 14,092
Not later than one year  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 13,145
Not later than one year | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 1,096
Not later than one year | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,661
Not later than one year | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 491
Not later than one year | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 384
Not later than one year | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 248
Not later than one year | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 5,431
Not later than one year | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 834
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 11,902
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 1,096
Later than one year and not later than two years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,099
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 319
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 258
Later than one year and not later than two years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 5,009
Later than one year and not later than two years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 738
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 11,006
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 1,096
Later than two years and not later than three years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,218
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 99
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 383
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 266
Later than two years and not later than three years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,285
Later than two years and not later than three years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 659
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 10,769
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 1,096
Later than three years and not later than four years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,342
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 20
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 385
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 274
Later than three years and not later than four years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,071
Later than three years and not later than four years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 581
Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 9,703
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 1,096
Later than four years and not later than five years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,575
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 0
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 386
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 251
Later than four years and not later than five years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 2,814
Later than four years and not later than five years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 581
Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 130,525
Later than five years [member] | Purchase of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 20,827
Later than five years [member] | Purchase of energy auctions [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 61,220
Later than five years [member] | Purchase of energy bilateral contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 0
Later than five years [member] | Quotas of angra 1 and angra 2 [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 7,225
Later than five years [member] | Transport of energy from itaipu [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 4,555
Later than five years [member] | Other energy purchase contracts [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments 25,999
Later than five years [member] | Physical quota guarantees [member]  
IfrsStatementLineItems [Line Items]  
Total contractual obligations and commitments R$ 10,699