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Borrowings and financing (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning R$ 17,723,836 R$ 17,258,624 R$ 13,244,709
Addition (lease) 42,182 140,187 28,549
Funding 2,834,551 2,959,633 4,845,860
Borrowing costs (27,525) (36,822) (68,386)
Monetary variation and exchange rate changes (301,716) 177,269 2,267,179
Inflation adjustment / exchange variation and incorporated interest - Capitalized 13,554 10,198 67,304
Interest paid (1,505,488) (845,445) (626,625)
Amortization (1,536,724) (2,896,604) (3,244,099)
Accrued interest 1,091,592 647,980 559,931
Provision for interest and fees - Capitalized 609,249 290,594 171,026
Expenses with borrowing costs 15,160 18,222 13,176
Borrowings and financing, ending 18,958,671 17,723,836 17,258,624
Total borrowings and financing (Note 17) 18,958,671 17,723,836 17,258,624
Local currency      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 14,427,683 13,710,762 6,885,911
Addition (lease) 42,182 140,187 28,549
Funding 2,553,091 2,816,545 4,752,889
Borrowing costs (17,627) (25,749) (59,453)
Monetary variation and exchange rate changes 190,202 225,791 86,939
Inflation adjustment / exchange variation and incorporated interest - Capitalized 10,250  
Interest paid (1,454,009) (788,587) (419,082)
Amortization (1,232,434) (2,553,645) (919,040)
Accrued interest 1,044,453 601,187 406,826
Provision for interest and fees - Capitalized 605,513 284,015 128,869
Expenses with borrowing costs 13,609 17,177 10,983
Borrowings and financing, ending 16,182,913 14,427,683 13,710,762
Total borrowings and financing (Note 17) 16,182,913 14,427,683 13,710,762
Foreignlocal currency translation     2,807,371
Local currency | Debentures [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 7,467,968 6,756,504 3,711,228
Addition (lease)  
Funding 1,000,000 2,450,000 3,507,640
Borrowing costs (4,320) (25,717) (52,328)
Monetary variation and exchange rate changes 165,879 225,106 86,939
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid (712,966) (387,618) (161,494)
Amortization (563,504) (1,963,282) (572,871)
Accrued interest 544,116 258,114 201,150
Provision for interest and fees - Capitalized 257,951 139,563 26,073
Expenses with borrowing costs 11,242 15,298 10,167
Borrowings and financing, ending 8,166,366 7,467,968 6,756,504
Total borrowings and financing (Note 17) 8,166,366 7,467,968 6,756,504
Local currency | Brazilian Federal Savings Banks [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,483,113 1,418,832 1,429,250
Addition (lease)  
Funding 119,437 156,488 74,485
Borrowing costs  
Monetary variation and exchange rate changes 17,247 685  
Inflation adjustment / exchange variation and incorporated interest - Capitalized 7,131  
Interest paid (117,041) (113,030) (111,601)
Amortization (100,855) (93,064) (84,821)
Accrued interest 80,422 79,966 73,067
Provision for interest and fees - Capitalized 36,731 33,236 38,452
Expenses with borrowing costs  
Borrowings and financing, ending 1,526,185 1,483,113 1,418,832
Total borrowings and financing (Note 17) 1,526,185 1,483,113 1,418,832
Local currency | BNDES [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 1,392,844 1,370,902 1,201,411
Addition (lease)  
Funding 200,000 207,136 213,514
Borrowing costs  
Monetary variation and exchange rate changes 7,020  
Inflation adjustment / exchange variation and incorporated interest - Capitalized 3,117  
Interest paid (104,596) (88,084) (47,164)
Amortization (222,353) (186,179) (81,213)
Accrued interest 67,311 51,122 47,668
Provision for interest and fees - Capitalized 37,391 37,688 36,427
Expenses with borrowing costs 259 259 259
Borrowings and financing, ending 1,380,993 1,392,844 1,370,902
Total borrowings and financing (Note 17) 1,380,993 1,392,844 1,370,902
Local currency | B I D 2202 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 2,589,442 2,730,195
Addition (lease)  
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid (281,971) (97,829) (37,613)
Amortization (181,349) (181,349) (90,674)
Accrued interest 98,574 63,964 22,668
Provision for interest and fees - Capitalized 224,899 73,506 27,886
Expenses with borrowing costs 955 955 557
Borrowings and financing, ending 2,450,550 2,589,442 2,730,195
Total borrowings and financing (Note 17) 2,450,550 2,589,442 2,730,195
Foreignlocal currency translation   2,807,371  
Local currency | B I D I N V E S T [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 956,942 944,513
Addition (lease)  
Funding 950,000
Borrowing costs (7,125)
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid (108,921) (33,276)  
Amortization (34,800) (18,340)  
Accrued interest 129,733 63,380 1,638
Provision for interest and fees - Capitalized  
Expenses with borrowing costs 665 665  
Borrowings and financing, ending 943,619 956,942 944,513
Total borrowings and financing (Note 17) 943,619 956,942 944,513
Local currency | I F C [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning    
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  
Total borrowings and financing (Note 17) 774,525  
Local currency | B I D I N V E S T 2022 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning    
Addition (lease)    
Funding 470,000    
Borrowing costs (3,922)    
Monetary variation and exchange rate changes    
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid (30,698)    
Amortization    
Accrued interest 33,840    
Provision for interest and fees - Capitalized    
Expenses with borrowing costs 107    
Borrowings and financing, ending 469,327  
Total borrowings and financing (Note 17) 469,327  
Local currency | Leases (Concession Agreements, Program Contracts and Contract Assets) [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 397,311 428,743 459,671
Addition (lease)  
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid (54,390) (52,250) (51,431)
Amortization (39,467) (31,432) (30,928)
Accrued interest 54,390 52,250 51,431
Provision for interest and fees - Capitalized  
Expenses with borrowing costs  
Borrowings and financing, ending 357,844 397,311 428,743
Total borrowings and financing (Note 17) 357,844 397,311 428,743
Local currency | Leases (Others) [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 125,969 45,876 74,453
Addition (lease) 42,182 140,187 28,549
Funding  
Borrowing costs  
Monetary variation and exchange rate changes  
Inflation adjustment / exchange variation and incorporated interest - Capitalized  
Interest paid (17,659) (15,782) (9,108)
Amortization (84,437) (76,013) (56,571)
Accrued interest 35,319 31,701 8,553
Provision for interest and fees - Capitalized  
Expenses with borrowing costs  
Borrowings and financing, ending 101,374 125,969 45,876
Total borrowings and financing (Note 17) 101,374 125,969 45,876
Local currency | Other Borrowings [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 14,094 15,197 9,898
Addition (lease)  
Funding 3,654 2,921 7,250
Borrowing costs (32)  
Monetary variation and exchange rate changes 56  
Inflation adjustment / exchange variation and incorporated interest - Capitalized 2  
Interest paid (789) (718) (671)
Amortization (5,669) (3,986) (1,962)
Accrued interest 748 690 651
Provision for interest and fees - Capitalized 34 22 31
Expenses with borrowing costs  
Borrowings and financing, ending 12,130 14,094 15,197
Total borrowings and financing (Note 17) 12,130 14,094 15,197
Foreign currency      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 3,296,153 3,547,862 6,358,798
Addition (lease)  
Funding 281,460 143,088 92,971
Borrowing costs (9,898) (11,073) (8,933)
Monetary variation and exchange rate changes (491,918) (48,522) 2,180,240
Inflation adjustment / exchange variation and incorporated interest - Capitalized 3,304 10,198 67,304
Interest paid (51,479) (56,858) (207,543)
Amortization (304,290) (342,959) (2,325,059)
Accrued interest 47,139 46,793 153,105
Provision for interest and fees - Capitalized 3,736 6,579 42,157
Expenses with borrowing costs 1,551 1,045 2,193
Borrowings and financing, ending 2,775,758 3,296,153 3,547,862
Total borrowings and financing (Note 17) 2,775,758 3,296,153 3,547,862
Foreignlocal currency translation     (2,807,371)
Foreign currency | BID [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 387,837 317,302 2,316,190
Addition (lease)
Funding 226,497 108,728 52,141
Borrowing costs (6,732) (7,620) (6,635)
Monetary variation and exchange rate changes (20,355) 22,979 845,246
Inflation adjustment / exchange variation and incorporated interest - Capitalized 48,246
Interest paid (12,581) (8,488) (45,010)
Amortization (56,273) (53,197) (121,088)
Accrued interest 13,733 7,936 10,490
Provision for interest and fees - Capitalized 24,695
Expenses with borrowing costs 567 197 398
Borrowings and financing, ending 532,693 387,837 317,302
Total borrowings and financing (Note 17) 532,693 387,837 317,302
Foreignlocal currency translation     (2,807,371)
Foreign currency | BIRD [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 420,881 426,860 357,880
Addition (lease)  
Funding 39,417  
Borrowing costs (3,166) (3,377) (2,029)
Monetary variation and exchange rate changes (28,665) 30,814 102,029
Inflation adjustment / exchange variation and incorporated interest - Capitalized 61 1,217
Interest paid (3,779) (2,481) (7,572)
Amortization (30,895) (32,965) (31,216)
Accrued interest 5,525 1,789 5,659
Provision for interest and fees - Capitalized 20 752
Expenses with borrowing costs 363 241 140
Borrowings and financing, ending 399,762 420,881 426,860
Total borrowings and financing (Note 17) 399,762 420,881 426,860
Foreign currency | JICA [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 2,401,887 2,684,321 2,106,908
Addition (lease)  
Funding 15,546 34,360 40,830
Borrowing costs (76) (117)
Monetary variation and exchange rate changes (437,296) (108,851) 715,956
Inflation adjustment / exchange variation and incorporated interest - Capitalized 3,243 10,198 17,841
Interest paid (33,167) (43,184) (43,758)
Amortization (177,007) (216,190) (200,597)
Accrued interest 26,597 35,315 40,172
Provision for interest and fees - Capitalized 3,102 5,802 6,897
Expenses with borrowing costs 204 192 189
Borrowings and financing, ending 1,803,109 2,401,887 2,684,321
Total borrowings and financing (Note 17) 1,803,109 2,401,887 2,684,321
Foreign currency | B I D 1983 A B 1 [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning 85,548 119,379 163,864
Addition (lease)    
Funding    
Borrowing costs   (152)
Monetary variation and exchange rate changes (5,602)   59,078
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid (1,952)   (7,033)
Amortization (40,115)   (103,482)
Accrued interest 1,284   5,843
Provision for interest and fees - Capitalized 614   618
Expenses with borrowing costs 417   643
Borrowings and financing, ending 40,194 85,548 119,379
Total borrowings and financing (Note 17) 40,194 85,548 119,379
Foreign currency | BID 1983AB [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning R$ 85,548 119,379  
Addition (lease)    
Funding    
Borrowing costs    
Monetary variation and exchange rate changes   6,536  
Inflation adjustment / exchange variation and incorporated interest - Capitalized    
Interest paid   (2,705)  
Amortization   (40,607)  
Accrued interest   1,753  
Provision for interest and fees - Capitalized   777  
Expenses with borrowing costs   415  
Borrowings and financing, ending   85,548 119,379
Total borrowings and financing (Note 17)   85,548 119,379
Foreign currency | Euro Bonds [Member]      
IfrsStatementLineItems [Line Items]      
Borrowings and financing, beginning   1,413,956
Monetary variation and exchange rate changes     457,931
Interest paid     (104,170)
Amortization     (1,868,676)
Accrued interest     90,941
Provision for interest and fees - Capitalized     9,195
Expenses with borrowing costs     823
Borrowings and financing, ending    
Total borrowings and financing (Note 17)