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16. Borrowings and financing (Details 2)
R$ in Thousands
Dec. 31, 2017
BRL (R$)
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 R$ 1,746,755
2019 1,779,363
2020 2,242,482
2021 858,401
2022 843,483
2023 634,128
2024 to 2038 3,996,354
Total 12,100,966
Local currency  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 1,199,384
2019 1,238,508
2020 778,583
2021 582,913
2022 567,995
2023 362,038
2024 to 2038 1,698,724
Total 6,428,145
Local currency | Debentures  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 901,480
2019 1,022,262
2020 576,364
2021 375,660
2022 354,807
2023 159,790
2024 to 2038 97,223
Total 3,487,586
Local currency | Brazilian Federal Savings Bank  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 78,487
2019 69,516
2020 71,998
2021 75,721
2022 79,743
2023 71,768
2024 to 2038 785,853
Total 1,233,086
Local currency | BNDES  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 98,523
2019 112,594
2020 94,467
2021 94,019
2022 94,019
2023 88,335
2024 to 2038 451,101
Total 1,033,058
Local currency | Leasing  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 17,573
2019 32,766
2020 34,384
2021 36,143
2022 38,056
2023 40,775
2024 to 2038 361,920
Total 561,617
Local currency | Other  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 1,466
2019 1,370
2020 1,370
2021 1,370
2022 1,370
2023 1,370
2024 to 2038 2,627
Total 10,943
Local currency | Interest and charges  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 101,855
2019 0
2020 0
2021 0
2022 0
2023 0
2024 to 2038 0
Total 101,855
Foreign currency  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 547,371
2019 540,855
2020 1,463,899
2021 275,488
2022 275,488
2023 272,090
2024 to 2038 2,297,630
Total 5,672,821
Foreign currency | Interest and charges  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 37,462
2019 0
2020 0
2021 0
2022 0
2023 0
2024 to 2038 0
Total 37,462
Foreign currency | BID  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 115,757
2019 115,757
2020 115,757
2021 115,757
2022 115,757
2023 115,758
2024 to 2038 1,034,572
Total 1,729,115
Foreign currency | BIRD  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 0
2019 10,056
2020 20,112
2021 20,112
2022 20,112
2023 20,113
2024 to 2038 211,160
Total 301,665
Foreign currency | Deutsche Bank  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 248,100
2019 242,343
2020 0
2021 0
2022 0
2023 0
2024 to 2038 0
Total 490,443
Foreign currency | Eurobonds  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 0
2019 0
2020 1,155,331
2021 0
2022 0
2023 0
2024 to 2038 0
Total 1,155,331
Foreign currency | JICA  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 66,851
2019 114,173
2020 114,173
2021 114,173
2022 114,173
2023 114,173
2024 to 2038 1,051,898
Total 1,689,614
Foreign currency | BID 1983AB  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
2018 79,201
2019 58,526
2020 58,526
2021 25,446
2022 25,446
2023 22,046
2024 to 2038 0
Total R$ 269,191