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17 Borrowings and financing (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]        
Current R$ 3,034,449 R$ 2,859,843    
Noncurrent 14,224,175 10,384,866    
Total 17,258,624 13,244,709 R$ 13,152,796 R$ 12,100,966
Local currency [member]        
Disclosure of detailed information about borrowings [line items]        
Current 2,674,805 977,943    
Noncurrent 11,035,957 5,907,968    
Total 13,710,762 6,885,911 6,483,387 6,428,145
Local currency [member] | 10th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 41,021    
Noncurrent 0 0    
Total 0 41,021    
Local currency [member] | 12th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 45,450 45,450    
Noncurrent 158,425 203,829    
Total 203,875 249,279    
Local currency [member] | 14th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 51,873 41,940    
Noncurrent 24,205 63,012    
Total 76,078 104,952    
Local currency [member] | 17th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 91,850 289,211    
Noncurrent 183,335 263,226    
Total 275,185 552,437    
Local currency [member] | 18th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 45,918 34,239    
Noncurrent 135,105 133,679    
Total 181,023 167,918    
Local currency [member] | 21st issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 175,000 150,000    
Noncurrent 174,769 349,660    
Total 349,769 499,660    
Local currency [member] | 22nd issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 99,969 0    
Noncurrent 678,149 765,689    
Total 778,118 765,689    
Local currency [member] | 23rd issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 0    
Noncurrent 864,678 864,603    
Total 864,678 864,603    
Local currency [member] | 24th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 0    
Noncurrent 414,994 395,855    
Total 414,994 395,855    
Local currency [member] | 25th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 1,442,610 0    
Noncurrent 0 0    
Total 1,442,610 0    
Local currency [member] | 26th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 0    
Noncurrent 1,047,767 0    
Total 1,047,767 0    
Local currency [member] | 27th issue debentures [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 0    
Noncurrent 997,000 0    
Total 997,000 0    
Local currency [member] | Brazilian federal savings bank [member]        
Disclosure of detailed information about borrowings [line items]        
Current 90,382 83,519    
Noncurrent 1,324,459 1,341,660    
Total 1,418,832 1,429,250 1,345,684 1,236,674
Local currency [member] | Brazilian Development Bank - BNDES PAC [member]        
Disclosure of detailed information about borrowings [line items]        
Current 13,185 11,184    
Noncurrent 20,247 27,854    
Total 33,432 39,038    
Local currency [member] | Brazilian Development Bank - BNDES PAC II 9751 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 7,159 6,990    
Noncurrent 37,447 40,685    
Total 44,606 47,675    
Local currency [member] | Brazilian Development Bank - BNDES PAC II 9752 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 4,851 3,913    
Noncurrent 25,470 24,457    
Total 30,321 28,370    
Local currency [member] | Brazilian Development Bank - BNDES ONDA LIMPA [member]        
Disclosure of detailed information about borrowings [line items]        
Current 26,751 23,704    
Noncurrent 86,809 100,582    
Total 113,560 124,286    
Local currency [member] | Brazilian Development Bank - BNDES TIETE III [member]        
Disclosure of detailed information about borrowings [line items]        
Current 86,823 52,874    
Noncurrent 542,519 383,191    
Total 629,342 436,065    
Local currency [member] | Brazilian Development Bank - BNDES 2015 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 33,558 31,712    
Noncurrent 454,126 460,646    
Total 487,684 492,358    
Local currency [member] | Brazilian Development Bank - BNDES 2014 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 5,143 4,659    
Noncurrent 23,017 25,411    
Total 28,160 30,070    
Local currency [member] | Leases (Concession Agreements, Program Contracts and Contract Assets) [member]        
Disclosure of detailed information about borrowings [line items]        
Current 28,847 27,314    
Noncurrent 399,896 432,357    
Total 428,743 459,671 568,666 561,616
Local currency [member] | Leases (Others) [member]        
Disclosure of detailed information about borrowings [line items]        
Current 36,576 51,088    
Noncurrent 9,300 23,365    
Total 45,876 74,453 [1] 0 [1]  
Local currency [member] | Other [member]        
Disclosure of detailed information about borrowings [line items]        
Current 3,778 1,665    
Noncurrent 11,382 8,207    
Total 15,160 9,872    
Local currency [member] | Interest and charges [member]        
Disclosure of detailed information about borrowings [line items]        
Current 158,918 77,460    
Noncurrent 0 0    
Total 158,918 77,460    
Local currency [member] | Inter-American Development Bank - BID 2202 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 181,349 0    
Noncurrent 2,524,798 0    
Total 2,706,147 0    
Local currency [member] | Inter-American Development Bank - BID INVEST [member]        
Disclosure of detailed information about borrowings [line items]        
Current 44,815 0    
Noncurrent 898,060 0    
Total 942,875 0    
Foreign currency [member]        
Disclosure of detailed information about borrowings [line items]        
Current 359,644 1,881,900    
Noncurrent 3,188,218 4,476,898    
Total 3,547,862 6,358,798 6,669,409 5,672,821
Foreign currency [member] | Interest and charges [member]        
Disclosure of detailed information about borrowings [line items]        
Current 21,577 44,967    
Noncurrent 0 0    
Total 21,577 44,967    
Foreign currency [member] | Inter-American Development Bank - BID 1212 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 53,412 41,428    
Noncurrent 213,649 207,140    
Total 267,061 248,568    
Foreign currency [member] | Inter-American Development Bank - BID 2202 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 128,623    
Noncurrent 0 1,914,298    
Total 0 2,042,921    
Foreign currency [member] | International Bank of Reconstruction and Development -BIRDs 7662 e 8906 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 31,594 24,505    
Noncurrent 393,949 330,898    
Total 425,543 355,403    
Foreign currency [member] | Eurobonds [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0 1,409,921    
Noncurrent 0 0    
Total 0 1,413,956 1,358,412 1,158,642
Foreign currency [member] | JICA 15 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 58,117 42,813    
Noncurrent 464,936 385,315    
Total 523,053 428,128    
Foreign currency [member] | JICA 18 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 52,253 38,493    
Noncurrent 417,846 346,237    
Total 470,099 384,730    
Foreign currency [member] | JICA 17 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 11,260 12,466    
Noncurrent 156,738 91,845    
Total 167,998 104,311    
Foreign currency [member] | JICA 19 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 91,456 67,372    
Noncurrent 1,415,683 1,109,644    
Total 1,507,139 1,177,016    
Foreign currency [member] | BID 1983AB [member]        
Disclosure of detailed information about borrowings [line items]        
Current 39,975 71,312    
Noncurrent 78,943 91,521    
Total 119,379 R$ 163,864 R$ 225,592 R$ 270,470
Foreign currency [member] | Inter-American Development Bank - BID 4623 [member]        
Disclosure of detailed information about borrowings [line items]        
Current 0      
Noncurrent 46,474      
Total R$ 46,474      
[1] The amount presented in Funding for Leasing (IFRS 16) includes R$ 64,955 referring to the initial adoption of the standard on January 1, 2019.