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Borrowings and financing (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning R$ 19,536,350 R$ 18,958,671 R$ 17,723,836
Addition (lease) 84,048 108,405 42,182
Funding 6,902,565 2,396,058 2,834,551
Borrowing costs (31,811) (24,947) (27,525)
Monetary variation and exchange rate changes 659,475 (163,322) (301,716)
Fair Value 34,388    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 31,979 29,465 13,554
Exchange rate change reclassified to OCI 48,728    
Interest paid (1,976,694) (1,936,419) (1,505,488)
Amortization (2,246,263) (1,771,090) (1,536,724)
Accrued interest 1,655,765 1,314,359 1,091,592
Provision for interest and fees - Capitalized 532,323 608,743 609,249
Provision for interest/rates reclassifiedto OCI 6,674    
Expenses with borrowing costs 20,770 16,427 15,160
Borrowings and financing, ending 25,258,297 19,536,350 18,958,671
Local Currency [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 16,790,459 16,182,913 14,427,683
Addition (lease) 84,048 108,405 42,182
Funding 6,668,823 1,837,687 2,553,091
Borrowing costs (24,966) (16,778) (17,627)
Monetary variation and exchange rate changes 134,253 146,637 190,202
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 30,976 29,360 10,250
Exchange rate change reclassified to OCI    
Interest paid (1,857,369) (1,852,280) (1,454,009)
Amortization (2,009,720) (1,492,795) (1,232,434)
Accrued interest 1,535,494 1,225,161 1,044,453
Provision for interest and fees - Capitalized 531,225 607,612 605,513
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 18,709 14,537 13,609
Borrowings and financing, ending 21,901,932 16,790,459 16,182,913
Local Currency [Member] | Debentures [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 7,534,818 8,166,366 7,467,968
Addition (lease)
Funding 5,440,478 1,000,000
Borrowing costs (13,010) (2,043) (4,320)
Monetary variation and exchange rate changes 116,330 114,228 165,879
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 25,579 21,421
Exchange rate change reclassified to OCI    
Interest paid (795,005) (839,833) (712,966)
Amortization (1,232,091) (741,812) (563,504)
Accrued interest 801,565 628,580 544,116
Provision for interest and fees - Capitalized 169,235 176,739 257,951
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 14,124 11,172 11,242
Borrowings and financing, ending 12,062,023 7,534,818 8,166,366
Local Currency [Member] | Brazilian Federal Savings Banks [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,621,014 1,526,185 1,483,113
Addition (lease)
Funding 165,873 174,058 119,437
Borrowing costs
Monetary variation and exchange rate changes 10,503 22,023 17,247
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 2,879 5,475 7,131
Exchange rate change reclassified to OCI    
Interest paid (128,418) (122,843) (117,041)
Amortization (112,399) (106,982) (100,855)
Accrued interest 101,284 98,428 80,422
Provision for interest and fees - Capitalized 27,321 24,670 36,731
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs
Borrowings and financing, ending 1,688,057 1,621,014 1,526,185
Local Currency [Member] | BNDES [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,341,472 1,380,993 1,392,844
Addition (lease)
Funding 190,000 200,000
Borrowing costs
Monetary variation and exchange rate changes 7,413 10,326 7,020
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 2,518 2,464 3,117
Exchange rate change reclassified to OCI    
Interest paid (93,215) (97,829) (104,596)
Amortization (281,867) (241,992) (222,353)
Accrued interest 67,629 78,745 67,311
Provision for interest and fees - Capitalized 24,887 18,516 37,391
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 238 249 259
Borrowings and financing, ending 1,069,075 1,341,472 1,380,993
Local Currency [Member] | BID 2202 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 2,252,742    
Addition (lease)    
Funding    
Borrowing costs    
Monetary variation and exchange rate changes    
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Exchange rate change reclassified to OCI    
Interest paid (257,571)    
Amortization (181,349)    
Accrued interest 139,993    
Provision for interest and fees - Capitalized 104,513    
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 955    
Borrowings and financing, ending 2,059,283 2,252,742  
Local Currency [Member] | BID INVEST 2020 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 900,367    
Addition (lease)    
Funding    
Borrowing costs    
Monetary variation and exchange rate changes    
Fair Value    
Exchange rate change reclassified to OCI    
Interest paid (115,506)    
Amortization (39,550)    
Accrued interest 15,854    
Provision for interest and fees - Capitalized 93,554    
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 661    
Borrowings and financing, ending 855,380 900,367  
Local Currency [Member] | IFC 2022 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 757,297 774,525  
Addition (lease)  
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Exchange rate change reclassified to OCI    
Interest paid (94,577) (114,131)  
Amortization (22,800) (15,200)  
Accrued interest 46,651 15,029  
Provision for interest and fees - Capitalized 46,372 96,160  
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 915 914  
Borrowings and financing, ending 733,858 757,297 774,525
Local Currency [Member] | IFC 2023 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,006,642  
Addition (lease)  
Funding 1,000,000  
Borrowing costs (528) (13,652)  
Monetary variation and exchange rate changes  
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Exchange rate change reclassified to OCI    
Interest paid (116,964) (2,434)  
Amortization  
Accrued interest 61,841 11,335  
Provision for interest and fees - Capitalized 60,871 11,090  
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 1,451 303  
Borrowings and financing, ending 1,013,313 1,006,642
Local Currency [Member] | IFC 2024 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning    
Addition (lease)    
Funding 1,060,000    
Borrowing costs (11,428)    
Monetary variation and exchange rate changes    
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Exchange rate change reclassified to OCI    
Interest paid    
Amortization    
Accrued interest 5,698    
Provision for interest and fees - Capitalized 4,470    
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 7    
Borrowings and financing, ending 1,058,747  
Local Currency [Member] | IDB INVEST 2022 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 454,543 469,327
Addition (lease)
Funding 470,000
Borrowing costs (3,922)
Monetary variation and exchange rate changes
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized
Exchange rate change reclassified to OCI    
Interest paid (59,504) (72,245) (30,698)
Amortization (14,100) (14,100)
Accrued interest 59,752 71,305 33,840
Provision for interest and fees - Capitalized
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 256 256 107
Borrowings and financing, ending 440,947 454,543 469,327
Local Currency [Member] | IDB INVEST 2023 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 464,131  
Addition (lease)  
Funding 470,000  
Borrowing costs (1,083)  
Monetary variation and exchange rate changes  
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Exchange rate change reclassified to OCI    
Interest paid (59,907) (41,022)  
Amortization (14,100) (7,050)  
Accrued interest 60,191 43,263  
Provision for interest and fees - Capitalized  
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 70 23  
Borrowings and financing, ending 450,385 464,131
Local Currency [Member] | Leases (Concession Agreements, Program Contracts and Contract Assets) [member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 309,210 357,844 397,311
Addition (lease)
Funding
Borrowing costs
Monetary variation and exchange rate changes
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized
Exchange rate change reclassified to OCI    
Interest paid (104,725) (54,135) (54,390)
Amortization (48,634) (39,467)
Accrued interest 112,659 54,135 54,390
Provision for interest and fees - Capitalized  
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs
Borrowings and financing, ending 317,144 309,210 357,844
Local Currency [Member] | Leases (Others) [member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 142,300 101,374 125,969
Addition (lease) 84,048 108,405 42,182
Funding
Borrowing costs
Monetary variation and exchange rate changes
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized
Exchange rate change reclassified to OCI    
Interest paid (31,799) (39,918) (17,659)
Amortization (105,839) (88,452) (84,437)
Accrued interest 62,214 60,891 35,319
Provision for interest and fees - Capitalized
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs
Borrowings and financing, ending 150,924 142,300 101,374
Local Currency [Member] | Other Borrowings [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 5,923 12,130 14,094
Addition (lease)
Funding 2,472 3,629 3,654
Borrowing costs  
Monetary variation and exchange rate changes 7 60 56
Inflation adjustment / exchange variation and incorporated interest - Capitalized 2
Exchange rate change reclassified to OCI    
Interest paid (178) (587) (789)
Amortization (5,625) (9,884) (5,669)
Accrued interest 163 566 748
Provision for interest and fees - Capitalized 2 9 34
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 32  
Borrowings and financing, ending 2,796 5,923 12,130
Local Currency [Member] | IDB 2202 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 2,252,742 2,450,550 2,589,442
Addition (lease)  
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid   (328,627) (281,971)
Amortization   (181,349) (181,349)
Accrued interest   135,524 98,574
Provision for interest and fees - Capitalized   175,689 224,899
Expenses with borrowing costs   955 955
Borrowings and financing, ending   2,252,742 2,450,550
Local Currency [Member] | IDB INVEST [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 900,367 943,619 956,942
Addition (lease)  
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid   (138,676) (108,921)
Amortization   (37,340) (34,800)
Accrued interest   27,360 129,733
Provision for interest and fees - Capitalized   104,739
Expenses with borrowing costs   665 665
Borrowings and financing, ending   900,367 943,619
Local Currency [Member] | IFC [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning   774,525
Addition (lease)    
Funding     760,000
Borrowing costs     (9,385)
Monetary variation and exchange rate changes    
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid     (24,978)
Amortization    
Accrued interest    
Provision for interest and fees - Capitalized     48,507
Expenses with borrowing costs     381
Borrowings and financing, ending     774,525
Foreign Currency [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 2,745,891 2,775,758 3,296,153
Addition (lease)
Funding 233,742 558,371 281,460
Borrowing costs (6,845) (8,169) (9,898)
Monetary variation and exchange rate changes 525,222 (309,959) (491,918)
Fair Value 34,388    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 1,003 105 3,304
Exchange rate change reclassified to OCI 48,728    
Interest paid (119,325) (84,139) (51,479)
Amortization (236,543) (278,295) (304,290)
Accrued interest 120,271 89,198 47,139
Provision for interest and fees - Capitalized 1,098 1,131 3,736
Provision for interest/rates reclassifiedto OCI 6,674    
Expenses with borrowing costs 2,061 1,890 1,551
Borrowings and financing, ending 3,356,365 2,745,891 2,775,758
Foreign Currency [Member] | IDBs [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 819,455 532,693 387,837
Addition (lease)
Funding 29,428 384,824 226,497
Borrowing costs (4,096) (5,137) (6,732)
Monetary variation and exchange rate changes 196,490 (45,895) (20,355)
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized
Exchange rate change reclassified to OCI 26,808    
Interest paid (58,916) (33,808) (12,581)
Amortization (53,446) (51,178) (56,273)
Accrued interest 57,242 36,929 13,733
Provision for interest and fees - Capitalized
Provision for interest/rates reclassifiedto OCI 3,609    
Expenses with borrowing costs 1,259 1,027 567
Borrowings and financing, ending 1,017,833 819,455 532,693
Foreign Currency [Member] | IBRD [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 515,015 399,762 420,881
Addition (lease)
Funding 204,314 173,547 39,417
Borrowing costs (2,749) (3,032) (3,166)
Monetary variation and exchange rate changes 132,645 (30,374) (28,665)
Fair Value    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 9 61
Exchange rate change reclassified to OCI 21,920    
Interest paid (37,492) (22,089) (3,779)
Amortization (32,319) (31,009) (30,895)
Accrued interest 40,715 27,663 5,525
Provision for interest and fees - Capitalized 298 57 20
Provision for interest/rates reclassifiedto OCI 3,065    
Expenses with borrowing costs 596 490 363
Borrowings and financing, ending 846,017 515,015 399,762
Foreign Currency [Member] | JICA [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,411,421 1,803,109 2,401,887
Addition (lease)
Funding 15,546
Borrowing costs
Monetary variation and exchange rate changes 196,087 (231,877) (437,296)
Fair Value 34,388    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 994 105 3,243
Exchange rate change reclassified to OCI    
Interest paid (22,917) (26,795) (33,167)
Amortization (150,778) (157,785) (177,007)
Accrued interest 22,314 23,697 26,597
Provision for interest and fees - Capitalized 800 763 3,102
Provision for interest/rates reclassifiedto OCI    
Expenses with borrowing costs 206 204 204
Borrowings and financing, ending 1,492,515 1,411,421 1,803,109
Foreign Currency [Member] | IDB 1983AB [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 40,194  
Funding    
Borrowing costs    
Monetary variation and exchange rate changes   (1,813)  
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid   (1,447)  
Amortization   (38,323)  
Accrued interest   909  
Provision for interest and fees - Capitalized   311  
Expenses with borrowing costs   169  
Borrowings and financing, ending   40,194
Foreign Currency [Member] | BID 1983AB [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning   R$ 40,194 85,548
Addition (lease)    
Funding    
Borrowing costs    
Monetary variation and exchange rate changes     (5,602)
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid     (1,952)
Amortization     (40,115)
Accrued interest     1,284
Provision for interest and fees - Capitalized     614
Expenses with borrowing costs     417
Borrowings and financing, ending     R$ 40,194