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Borrowings and financing (Details 3)
R$ in Thousands
Dec. 31, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]  
2025 R$ 3,133,850
2026 4,821,836
2027 2,481,522
2028 1,763,154
2029 2,398,069
2030 2,479,936
2031 to 2044 8,179,930
Borrowings payment net 25,258,297
Local Currency [Member]  
IfrsStatementLineItems [Line Items]  
2025 2,770,773
2026 4,563,607
2027 2,223,293
2028 1,504,925
2029 2,127,412
2030 2,283,039
2031 to 2044 6,428,883
Borrowings payment net 21,901,932
Local Currency [Member] | Debentures [Member]  
IfrsStatementLineItems [Line Items]  
2025 1,323,040
2026 3,719,487
2027 1,415,030
2028 674,405
2029 1,316,921
2030 1,288,121
2031 to 2044 1,959,219
Borrowings payment net 11,696,223
Local Currency [Member] | Brazilian Federal Savings Bank [Member]  
IfrsStatementLineItems [Line Items]  
2025 123,495
2026 131,136
2027 139,242
2028 147,721
2029 153,538
2030 151,203
2031 to 2044 837,007
Borrowings payment net 1,683,342
Local Currency [Member] | BNDES [Member]  
IfrsStatementLineItems [Line Items]  
2025 262,709
2026 252,712
2027 239,862
2028 84,973
2029 34,436
2030 34,436
2031 to 2044 156,592
Borrowings payment net 1,065,720
Local Currency [Member] | IDBs National [Member]  
IfrsStatementLineItems [Line Items]  
2025 260,899
2026 330,209
2027 315,069
2028 420,959
2029 383,238
2030 349,769
2031 to 2044 1,626,286
Borrowings payment net 3,686,429
Local Currency [Member] | IFCs [Member]  
IfrsStatementLineItems [Line Items]  
2025 44,200
2026 64,450
2027 91,400
2028 147,450
2029 218,700
2030 335,000
2031 to 2044 1,849,779
Borrowings payment net 2,750,979
Local Currency [Member] | Leases (Concession Agreements, Program Contracts and Contract Assets) [member]  
IfrsStatementLineItems [Line Items]  
2025 206,190
2026 64,682
2027 22,690
2028 29,417
2029 20,579
2030 124,510
2031 to 2044
Borrowings payment net 468,068
Local Currency [Member] | Other Borrowings [Member]  
IfrsStatementLineItems [Line Items]  
2025 1,868
2026 931
2027
Borrowings payment net 2,799
Local Currency [Member] | Borrowings Interest And Charges [Member]  
IfrsStatementLineItems [Line Items]  
2025 548,372
Borrowings payment net 548,372
Foreign Currency [Member]  
IfrsStatementLineItems [Line Items]  
2025 363,077
2026 258,229
2027 258,229
2028 258,229
2029 270,657
2030 196,897
2031 to 2044 1,751,047
Borrowings payment net 3,356,365
Foreign Currency [Member] | Borrowings Interest And Charges [Member]  
IfrsStatementLineItems [Line Items]  
2025 32,394
Borrowings payment net 32,394
Foreign Currency [Member] | IDB [Member]  
IfrsStatementLineItems [Line Items]  
2025 89,222
2026 51,155
2027 51,155
2028 51,155
2029 51,155
2030 51,155
2031 to 2044 663,414
Borrowings payment net 1,008,411
Foreign Currency [Member] | IBRD [Member]  
IfrsStatementLineItems [Line Items]  
2025 37,707
2026 37,707
2027 37,707
2028 37,707
2029 50,233
2030 62,759
2031 to 2044 567,584
Borrowings payment net 831,404
Foreign Currency [Member] | JICA [Member]  
IfrsStatementLineItems [Line Items]  
2025 203,754
2026 169,367
2027 169,367
2028 169,367
2029 169,269
2030 82,983
2031 to 2044 520,049
Borrowings payment net R$ 1,484,156