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Borrowings and financing (Details) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Current R$ 2,716,361 R$ 2,616,406    
Noncurrent 19,307,946 16,919,944    
Total 22,024,307 19,536,350 R$ 18,295,923 R$ 18,958,671
Local Currency [Member]        
IfrsStatementLineItems [Line Items]        
Current 2,470,062 2,366,705    
Noncurrent 16,923,153 14,423,754    
Total 19,393,215 16,790,459    
Local Currency [Member] | Twelth Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 56,517 45,450    
Noncurrent 22,385    
Total 56,517 67,835    
Local Currency [Member] | Eighteenth Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 40,975 46,962    
Noncurrent    
Total 40,975 46,962    
Local Currency [Member] | Twenty Second Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 174,245 170,957    
Noncurrent 170,616    
Total 174,245 341,573    
Local Currency [Member] | Twenty Third Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 490,841 490,810    
Noncurrent 374,303 374,279    
Total 865,144 865,089    
Local Currency [Member] | Twenty Fourth Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 523,163 512,122    
Total 523,163 512,122    
Local Currency [Member] | Twenty Sixth Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 1,330,768 1,302,042    
Total 1,330,768 1,302,042    
Local Currency [Member] | Twenty Seventh Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 200,000 200,000    
Noncurrent 498,704 498,634    
Total 698,704 698,634    
Local Currency [Member] | Twenty Eight Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 127,745 127,715    
Noncurrent 1,070,548 1,070,457    
Total 1,198,293 1,198,172    
Local Currency [Member] | Twenty Nine Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 1,332,090 1,314,136    
Total 1,332,090 1,314,136    
Local Currency [Member] | Thirty Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current 124,988 125,000    
Noncurrent 748,275 873,231    
Total 873,263 998,231    
Local Currency [Member] | Thirty One Issue Debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 2,933,677    
Total 2,933,677    
Local Currency [Member] | Brazilian Federal Savings Bank [Member]        
IfrsStatementLineItems [Line Items]        
Current 110,235 108,210    
Noncurrent 1,489,676 1,508,275    
Total 1,599,911 1,616,485    
Local Currency [Member] | Brazilian Development Bank B N D E S P A C I I 9751 [Member]        
IfrsStatementLineItems [Line Items]        
Current 7,295 7,286    
Noncurrent 14,519 16,316    
Total 21,814 23,602    
Local Currency [Member] | Brazilian Development Bank B N D E S P A C I I 9752 [Member]        
IfrsStatementLineItems [Line Items]        
Current 4,943 4,936    
Noncurrent 9,885 11,107    
Total 14,828 16,043    
Local Currency [Member] | Brazilian Development Bank B N D E S O N D A L I M P A [Member]        
IfrsStatementLineItems [Line Items]        
Current 27,223 27,219    
Noncurrent 6,766    
Total 27,223 33,985    
Local Currency [Member] | Brazilian Development Bank B N D E S T I E T E I I I [Member]        
IfrsStatementLineItems [Line Items]        
Current 200,947 200,693    
Noncurrent 602,767 652,175    
Total 803,714 852,868    
Local Currency [Member] | Brazilian Development Bank B N D E S T 2015 [Member]        
IfrsStatementLineItems [Line Items]        
Current 34,189 34,146    
Noncurrent 351,960 360,021    
Total 386,149 394,167    
Local Currency [Member] | Brazilian Development Bank B N D E S 2014 [Member]        
IfrsStatementLineItems [Line Items]        
Current 6,646 6,638    
Noncurrent 8,471 10,107    
Total 15,117 16,745    
Local Currency [Member] | Inter American Development Bank I D B 2202 [Member]        
IfrsStatementLineItems [Line Items]        
Current 181,349 181,349    
Noncurrent 1,893,180 1,983,615    
Total 2,074,529 2,164,964    
Local Currency [Member] | Inter American Development Bank I D B I N V E S T [Member]        
IfrsStatementLineItems [Line Items]        
Current 41,760 39,550    
Noncurrent 794,125 814,840    
Total 835,885 854,390    
Local Currency [Member] | Inter American Development Bank I D B I N V E S T 2022 [Member]        
IfrsStatementLineItems [Line Items]        
Current 14,100 14,100    
Noncurrent 438,305 438,241    
Total 452,405 452,341    
Local Currency [Member] | Inter American Development Bank I D B I N V E S T 2023 [Member]        
IfrsStatementLineItems [Line Items]        
Current 14,100 14,100    
Noncurrent 447,808 447,791    
Total 461,908 461,891    
Local Currency [Member] | International Finance Corporation I F C 2022 [Member]        
IfrsStatementLineItems [Line Items]        
Current 22,800 22,800    
Noncurrent 714,139 713,910    
Total 736,939 736,710    
Local Currency [Member] | International Finance Corporation I F C 2023 [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 987,006 986,651    
Total 987,006 986,651    
Local Currency [Member] | Leases Concession Agreements Program Contracts And Contract Assets [Member]        
IfrsStatementLineItems [Line Items]        
Current 106,362 49,884    
Noncurrent 206,075 259,326    
Total 312,437 309,210    
Local Currency [Member] | Leases Others [Member]        
IfrsStatementLineItems [Line Items]        
Current 100,102 68,499    
Noncurrent 151,548 73,801    
Total 251,650 142,300    
Local Currency [Member] | Others [Member]        
IfrsStatementLineItems [Line Items]        
Current 3,006 3,003    
Noncurrent 2,161 2,910    
Total 5,167 5,913    
Local Currency [Member] | Interest And Charges [Member]        
IfrsStatementLineItems [Line Items]        
Current 379,694 377,398    
Noncurrent    
Total 379,694 377,398    
Foreign Currency [Member]        
IfrsStatementLineItems [Line Items]        
Current 246,299 249,701    
Noncurrent 2,384,793 2,496,190    
Total 2,631,092 2,745,891    
Foreign Currency [Member] | Interest And Charges [Member]        
IfrsStatementLineItems [Line Items]        
Current 22,933 23,677    
Noncurrent    
Total 22,933 23,677    
Foreign Currency [Member] | Inter American Development Bank I D B 1212 [Member]        
IfrsStatementLineItems [Line Items]        
Current 51,351 49,759    
Noncurrent 25,676 49,759    
Total 77,027 99,518    
Foreign Currency [Member] | Inter American Development Bank I D B 4623 [Member]        
IfrsStatementLineItems [Line Items]        
Current    
Noncurrent 736,321 712,449    
Total 736,321 712,449    
Foreign Currency [Member] | International Bank Of Reconstruction And Development I B R Ds 7662e 8906 [Member]        
IfrsStatementLineItems [Line Items]        
Current 30,375 29,433    
Noncurrent 476,883 477,554    
Total 507,258 506,987    
Foreign Currency [Member] | J I C A 15 [Member]        
IfrsStatementLineItems [Line Items]        
Current 38,042 39,437    
Noncurrent 171,188 197,180    
Total 209,230 236,617    
Foreign Currency [Member] | J I C A 18 [Member]        
IfrsStatementLineItems [Line Items]        
Current 34,204 35,457    
Noncurrent 153,803 177,168    
Total 188,007 212,625    
Foreign Currency [Member] | J I C A 17 [Member]        
IfrsStatementLineItems [Line Items]        
Current 9,530 9,879    
Noncurrent 104,054 107,880    
Total 113,584 117,759    
Foreign Currency [Member] | J I C A 19 [Member]        
IfrsStatementLineItems [Line Items]        
Current 59,864 62,059    
Noncurrent 716,868 774,200    
Total R$ 776,732 R$ 836,259