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17 Borrowings and financing (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning R$ 13,244,709 R$ 13,152,796 R$ 12,100,966
Foreign/local currency translation 0    
Addition (lease) 28,549    
Addition as per IFRS 16   113,233  
Funding 4,845,860 1,808,587 1,640,130
Borrowing costs (68,386) (15,199) (5,577)
Monetary variation and exchange rate changes 2,267,179 280,526 982,072
Inflation adjustment / exchange variation and incorporated interest - Capitalized 238,330 233,251 488,502
Interest paid (626,625) (737,326)  
Interest and fees paid     (732,048)
Amortization (3,244,099) (2,148,198) (1,678,748)
Accrued interest 559,931 568,679 563,902
Provision for interest and fees - Capitalized 171,026 153,177 198,061 [1]
Expenses with borrowing costs 13,176   10,214
Amortization of borrowing costs   9,128  
Borrowings and financing, ending 17,258,624 13,244,709 13,152,796
Local currency [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 6,885,911 6,483,387 6,428,145
Foreign/local currency translation 2,807,371    
Addition (lease) 28,549    
Addition as per IFRS 16   113,233  
Funding 4,752,889 1,688,186 1,075,244
Borrowing costs (59,453) (12,442) (3,021)
Monetary variation and exchange rate changes 86,939 46,567 66,183
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 4,587 10,367
Interest paid (419,082) (476,313)  
Interest and fees paid     (491,312)
Amortization (919,040) (1,433,962) (1,111,806)
Accrued interest 406,826 385,470 372,440
Provision for interest and fees - Capitalized 128,869 83,119 133,540 [1]
Expenses with borrowing costs 10,983   3,607
Amortization of borrowing costs   4,079  
Borrowings and financing, ending 13,710,762 6,885,911 6,483,387
Local currency [member] | Debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 3,711,228 3,486,861 3,576,842
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 3,507,640 1,266,755 750,000
Borrowing costs (52,328) (11,814) (3,021)
Monetary variation and exchange rate changes 86,939 42,692 62,676
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 0 0
Interest paid (161,494) (234,307)  
Interest and fees paid     (259,175)
Amortization (572,871) (1,055,623) (905,080)
Accrued interest 201,150 195,586 226,810
Provision for interest and fees - Capitalized 26,073 17,233 34,409 [1]
Expenses with borrowing costs 10,167   3,400
Amortization of borrowing costs   3,845  
Borrowings and financing, ending 6,756,504 3,711,228 3,486,861
Local currency [member] | Brazilian federal savings bank [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 1,429,250 1,345,684 1,236,674
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 74,485 162,767 194,244
Borrowing costs 0 0 0
Monetary variation and exchange rate changes 0 0 0
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 0 0
Interest paid (111,601) (109,128)  
Interest and fees paid     (102,772)
Amortization (84,821) (79,404) (85,515)
Accrued interest 73,067 74,421 75,668
Provision for interest and fees - Capitalized 38,452 34,910 27,385 [1]
Expenses with borrowing costs 0   0
Amortization of borrowing costs   0  
Borrowings and financing, ending 1,418,832 1,429,250 1,345,684
Local currency [member] | BNDES [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 1,201,411 1,072,605 1,042,036
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 213,514 256,981 131,000
Borrowing costs 0 (628) 0
Monetary variation and exchange rate changes 0 2,082 3,438
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 826 4,001
Interest paid (47,164) (83,419)  
Interest and fees paid     (90,397)
Amortization (81,213) (131,026) (102,314)
Accrued interest 47,668 60,644 28,909
Provision for interest and fees - Capitalized 36,427 23,112 55,725 [1]
Expenses with borrowing costs 259   207
Amortization of borrowing costs   234  
Borrowings and financing, ending 1,370,902 1,201,411 1,072,605
Local currency [member] | BID 2202 [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 0    
Foreign/local currency translation 2,807,371    
Addition (lease) 0    
Funding 0    
Borrowing costs 0    
Monetary variation and exchange rate changes 0    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0    
Interest paid (37,613)    
Amortization (90,674)    
Accrued interest 22,668    
Provision for interest and fees - Capitalized 27,886    
Expenses with borrowing costs 557    
Borrowings and financing, ending 2,730,195 0  
Local currency [member] | BID INVEST [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 0    
Foreign/local currency translation 0    
Addition (lease) 0    
Funding 950,000    
Borrowing costs (7,125)    
Monetary variation and exchange rate changes 0    
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0    
Interest paid 0    
Amortization 0    
Accrued interest 1,638    
Provision for interest and fees - Capitalized 0    
Expenses with borrowing costs 0    
Borrowings and financing, ending 944,513 0  
Local currency [member] | Leases (Concession Agreements, Program Contracts and Contract Assets) [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 459,671 568,666 561,616
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 0 0 0
Borrowing costs 0 0 0
Monetary variation and exchange rate changes 0 1,765 0
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 3,761 6,366
Interest paid (51,431) (47,663)  
Interest and fees paid     (38,196)
Amortization (30,928) (123,880) (17,427)
Accrued interest 51,431 49,160 40,290
Provision for interest and fees - Capitalized 0 7,862 16,017 [1]
Expenses with borrowing costs 0   0
Amortization of borrowing costs   0  
Borrowings and financing, ending 428,743 459,671 568,666
Local currency [member] | Leases (Others) [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning [2] 74,453 0  
Foreign/local currency translation 0    
Addition (lease) 28,549    
Addition as per IFRS 16 [2]   113,233  
Funding 0 0 [2]  
Borrowing costs 0 0 [2]  
Monetary variation and exchange rate changes 0 0 [2]  
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 0 [2]  
Interest paid (9,108) (1,141) [2]  
Amortization (56,571) (42,646) [2]  
Accrued interest 8,553 5,007 [2]  
Provision for interest and fees - Capitalized 0 0 [2]  
Expenses with borrowing costs 0    
Amortization of borrowing costs [2]   0  
Borrowings and financing, ending 45,876 74,453 [2] 0 [2]
Local currency [member] | Other borrowings [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 9,898 9,571 10,977
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 7,250 1,683 0
Borrowing costs 0 0 0
Monetary variation and exchange rate changes 0 28 69
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 0 0
Interest paid (671) (655)  
Interest and fees paid     (772)
Amortization (1,962) (1,383) (1,470)
Accrued interest 651 652 763
Provision for interest and fees - Capitalized 31 2 4 [1]
Expenses with borrowing costs 0   0
Amortization of borrowing costs   0  
Borrowings and financing, ending 15,197 9,898 9,571
Foreign currency [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 6,358,798 6,669,409 5,672,821
Foreign/local currency translation (2,807,371)    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 92,971 120,401 564,886
Borrowing costs (8,933) (2,757) (2,556)
Monetary variation and exchange rate changes 2,180,240 233,959 915,889
Inflation adjustment / exchange variation and incorporated interest - Capitalized 67,304 54,719 63,457
Interest paid (207,543) (261,013)  
Interest and fees paid     (240,736)
Amortization (2,325,059) (714,236) (566,942)
Accrued interest 153,105 183,209 191,462
Provision for interest and fees - Capitalized 42,157 70,058 64,521 [1]
Expenses with borrowing costs 2,193   6,607
Amortization of borrowing costs   5,049  
Borrowings and financing, ending 3,547,862 6,358,798 6,669,409
Foreign currency [member] | BID [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 2,316,190 2,399,985 1,743,257
Foreign/local currency translation (2,807,371)    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 52,141 0 484,690
Borrowing costs (6,635) 0 (2,365)
Monetary variation and exchange rate changes 845,246 40,594 237,433
Inflation adjustment / exchange variation and incorporated interest - Capitalized 48,246 49,387 53,208
Interest paid (45,010) (83,602)  
Interest and fees paid     (55,391)
Amortization (121,088) (171,892) (130,520)
Accrued interest 10,490 26,332 26,910
Provision for interest and fees - Capitalized 24,695 54,431 41,878 [1]
Expenses with borrowing costs 398   885
Amortization of borrowing costs   955  
Borrowings and financing, ending 317,302 2,316,190 2,399,985
Foreign currency [member] | BIRD [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 357,880 356,420 303,278
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 0 2,540 0
Borrowing costs (2,029) (2,540) 0
Monetary variation and exchange rate changes 102,029 12,575 48,279
Inflation adjustment / exchange variation and incorporated interest - Capitalized 1,217 1,657 3,462
Interest paid (7,572) (10,627)  
Interest and fees paid     (7,607)
Amortization (31,216) (12,273) 0
Accrued interest 5,659 8,548 6,945
Provision for interest and fees - Capitalized 752 1,561 2,044 [1]
Expenses with borrowing costs 140   19
Amortization of borrowing costs   19  
Borrowings and financing, ending 426,860 357,880 356,420
Foreign currency [member] | Eurobonds [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 1,413,956 1,358,412 1,158,642
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 0 0 0
Borrowing costs 0 0 0
Monetary variation and exchange rate changes 457,931 54,565 198,380
Inflation adjustment / exchange variation and incorporated interest - Capitalized 0 0 0
Interest paid (104,170) (102,883)  
Interest and fees paid     (97,952)
Amortization (1,868,676) 0 0
Accrued interest 90,941 94,095 85,072
Provision for interest and fees - Capitalized 9,195 8,943 13,448 [1]
Expenses with borrowing costs 823   822
Amortization of borrowing costs   824  
Borrowings and financing, ending 0 1,413,956 1,358,412
Foreign currency [member] | JICA [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 2,106,908 2,036,128 1,700,448
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 40,830 117,861 80,196
Borrowing costs (117) (112) (191)
Monetary variation and exchange rate changes 715,956 104,027 329,638
Inflation adjustment / exchange variation and incorporated interest - Capitalized 17,841 3,675 6,787
Interest paid (43,758) (35,001)  
Interest and fees paid     (33,519)
Amortization (200,597) (155,064) (82,608)
Accrued interest 40,172 32,194 33,992
Provision for interest and fees - Capitalized 6,897 3,013 1,209 [1]
Expenses with borrowing costs 189   176
Amortization of borrowing costs   187  
Borrowings and financing, ending 2,684,321 2,106,908 2,036,128
Foreign currency [member] | BID 1983AB [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning 163,864 225,592 270,470
Foreign/local currency translation 0    
Addition (lease) 0    
Addition as per IFRS 16   0  
Funding 0 0 0
Borrowing costs (152) (105) 0
Monetary variation and exchange rate changes 59,078 8,943 39,241
Inflation adjustment / exchange variation and incorporated interest - Capitalized   0 0
Interest paid (7,033) (10,338)  
Interest and fees paid     (11,060)
Amortization (103,482) (71,141) (85,306)
Accrued interest 5,843 9,111 9,681
Provision for interest and fees - Capitalized 618 870 1,488 [1]
Expenses with borrowing costs 643   1,078
Amortization of borrowing costs   932  
Borrowings and financing, ending 119,379 163,864 225,592
Foreign currency [member] | Deutsche Bank [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings and financing, beginning R$ 0 292,872 496,726
Addition as per IFRS 16   0  
Funding   0 0
Borrowing costs   0 0
Monetary variation and exchange rate changes   13,255 62,918
Inflation adjustment / exchange variation and incorporated interest - Capitalized   0 0
Interest paid   (18,562)  
Interest and fees paid     (35,207)
Amortization   (303,866) (268,508)
Accrued interest   12,929 28,862
Provision for interest and fees - Capitalized   1,240 4,454 [1]
Expenses with borrowing costs     3,627
Amortization of borrowing costs   2,132  
Borrowings and financing, ending   R$ 0 R$ 292,872
[1] amount related to accrued interest which as part of the contract assets.
[2] 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.