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17 Borrowings and financing (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
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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.

X
- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are recognised as an expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The cash outflow to settle borrowings, classified as financing activities. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_17_d&doctype=Standard -URIDate 2020-01-01 + Details
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