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16. Borrowings and financing (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | R$ 1,746,755 | R$ 1,246,567 |
Noncurrent | 10,354,211 | 10,717,576 |
Total | 12,100,966 | 11,964,143 | R$ 13,121,600
Local currency |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 1,199,384 | 879,908 |
Noncurrent | 5,228,761 | 5,423,872 |
Total | 6,428,145 | 6,303,780 | 6,503,776
Local currency | 10th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 41,702 | 40,967 |
Noncurrent | 80,953 | 120,343 |
Total | 122,655 | 161,310 |
Local currency | 12th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 45,450 | 45,450 |
Noncurrent | 294,702 | 340,165 |
Total | 340,152 | 385,615 |
Local currency | 14th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 40,503 | 39,802 |
Noncurrent | 141,351 | 178,571 |
Total | 181,854 | 218,373 |
Local currency | 15th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 346,414 | 97,692 |
Noncurrent | 345,788 | 672,657 |
Total | 692,202 | 770,349 |
Local currency | 17th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 144,391 | 140,144 |
Noncurrent | 781,922 | 904,094 |
Total | 926,313 | 1,044,238 |
Local currency | 18th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 33,020 | 32,436 |
Noncurrent | 194,872 | 223,840 |
Total | 227,892 | 256,276 |
Local currency | 19th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 199,461 |
Noncurrent | 0 | 0 |
Total | 0 | 199,461 |
Local currency | 20th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 250,000 | 0 |
Noncurrent | 246,890 | 495,533 |
Total | 496,890 | 495,533 |
Local currency | 21th issue debentures |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 0 |
Noncurrent | 499,628 | 0 |
Total | 499,628 | 0 |
Local currency | Brazilian Federal Savings Bank |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 78,487 | 59,199 |
Noncurrent | 1,154,599 | 1,088,160 |
Total | 1,233,086 | 1,147,359 | 1,067,464
Local currency | Brazilian Development Bank - BNDES BAIXADA SANTISTA |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 16,782 | 16,603 |
Noncurrent | 16,782 | 33,207 |
Total | 33,564 | 49,810 |
Local currency | Brazilian Development Bank - BNDES PAC |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 11,143 | 10,987 |
Noncurrent | 50,028 | 60,293 |
Total | 61,171 | 71,280 |
Local currency | Brazilian Development Bank - BNDES PAC II 9751 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 4,334 | 4,288 |
Noncurrent | 22,991 | 27,007 |
Total | 27,325 | 31,295 |
Local currency | Brazilian Development Bank - BNDES PAC II 9752 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 2,367 | 2,341 |
Noncurrent | 19,526 | 21,659 |
Total | 21,893 | 24,000 |
Local currency | Brazilian Development Bank - BNDES ONDA LIMPA |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 23,469 | 23,219 |
Noncurrent | 146,461 | 168,083 |
Total | 169,930 | 191,302 |
Local currency | Brazilian Development Bank - BNDES TIETÊ III |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 30,378 | 30,054 |
Noncurrent | 280,825 | 307,862 |
Total | 311,203 | 337,916 |
Local currency | Brazilian Development Bank - BNDES 2015 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 10,050 | 0 |
Noncurrent | 397,922 | 233,967 |
Total | 407,972 | 233,967 |
Local currency | Leases |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 17,573 | 14,914 |
Noncurrent | 544,044 | 537,602 |
Total | 561,617 | 552,516 |
Local currency | Other |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 1,466 | 746 |
Noncurrent | 9,477 | 10,829 |
Total | 10,943 | 11,575 |
Local currency | Interest and charges |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 101,855 | 121,605 |
Noncurrent | 0 | 0 |
Total | 101,855 | 121,605 |
Foreign currency |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 547,371 | 366,659 |
Noncurrent | 5,125,450 | 5,293,704 |
Total | 5,672,821 | 5,660,363 | 6,617,824
Foreign currency | Interest and charges |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 37,462 | 35,883 |
Noncurrent | 0 | 0 |
Total | 37,462 | 35,883 |
Foreign currency | Inter-American Development Bank - BID 713 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 81,794 |
Noncurrent | 0 | 0 |
Total | 0 | 81,794 |
Foreign currency | Inter-American Development Bank - BID 1212 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 34,000 | 33,499 |
Noncurrent | 238,000 | 267,979 |
Total | 272,000 | 301,478 |
Foreign currency | Inter-American Development Bank - BID 2202 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 81,757 | 75,143 |
Noncurrent | 1,375,358 | 1,339,803 |
Total | 1,457,115 | 1,414,946 |
Foreign currency | International Bank of Reconstruction and Development -BIRD |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 0 |
Noncurrent | 301,665 | 260,224 |
Total | 301,665 | 260,224 |
Foreign currency | Deutsche Bank |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 248,100 | 0 |
Noncurrent | 242,343 | 480,244 |
Total | 490,443 | 480,244 | 0
Foreign currency | Eurobonds |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 0 |
Noncurrent | 1,155,331 | 1,137,395 |
Total | 1,155,331 | 1,137,395 | 1,922,256
Foreign currency | JICA 15 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 33,881 | 32,175 |
Noncurrent | 372,696 | 386,111 |
Total | 406,577 | 418,286 |
Foreign currency | JICA 18 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 30,463 | 28,930 |
Noncurrent | 334,849 | 346,889 |
Total | 365,312 | 375,819 |
Foreign currency | JICA 17 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 2,507 | 1,205 |
Noncurrent | 41,835 | 42,675 |
Total | 44,342 | 43,880 |
Foreign currency | JICA 19 |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 0 | 0 |
Noncurrent | 873,383 | 768,463 |
Total | 873,383 | 768,463 |
Foreign currency | BID 1983AB |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Current | 79,201 | 78,030 |
Noncurrent | 189,990 | 263,921 |
Total | R$ 269,191 | R$ 341,951 | R$ 505,306

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