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16. Borrowings and financing (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning R$ 11,964,143 R$ 13,121,600  
Funding 1,012,315 1,267,697  
Borrowing costs (4,743) (17,173)  
Lease 24,693 32,111  
Monetary variation  and exchange rate changes 159,087 (969,430)  
Inflation adjustment / update and incorporated interest - Capitalized 49,517 51,559  
Interest and fees paid (676,087) (739,944)  
Amortization (1,098,558) (1,535,312) R$ (1,292,322)
Accrued interest 426,781 449,470  
Provision for interest rates and fees - Capitalized 233,341 295,828  
Borrowing costs expenses 10,477 7,737  
Borrowings and financing, ending 12,100,966 11,964,143 13,121,600
Local currency      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 6,303,780 6,503,776  
Funding 815,807 436,396  
Borrowing costs (1,157) (3,483)  
Lease 24,693 32,111  
Monetary variation  and exchange rate changes 62,784 121,035  
Inflation adjustment / update and incorporated interest - Capitalized 3,927 6,405  
Interest and fees paid (476,689) (521,634)  
Amortization (767,966) (807,396)  
Accrued interest 289,780 317,379  
Provision for interest rates and fees - Capitalized 169,366 214,954  
Borrowing costs expenses 3,820 4,237  
Borrowings and financing, ending 6,428,145 6,303,780 6,503,776
Local currency | Debentures      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 3,641,912 4,203,127  
Funding 500,000 0  
Borrowing costs (1,157) (1,241)  
Lease 0 0  
Monetary variation  and exchange rate changes 51,768 105,385  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (301,493) (375,027)  
Amortization (597,794) (663,468)  
Accrued interest 176,780 214,245  
Provision for interest rates and fees - Capitalized 103,215 154,814  
Borrowing costs expenses 3,611 4,077  
Borrowings and financing, ending 3,576,842 3,641,912 4,203,127
Local currency | Brazilian Federal Savings Bank      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,147,359 1,067,464  
Funding 144,654 113,310  
Borrowing costs 0 0  
Lease 0 0  
Monetary variation  and exchange rate changes 5,495 15,619  
Inflation adjustment / update and incorporated interest - Capitalized 1,415 6,405  
Interest and fees paid (95,854) (89,896)  
Amortization (65,836) (52,315)  
Accrued interest 78,283 63,813  
Provision for interest rates and fees - Capitalized 17,826 26,291  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 1,233,086 1,147,359 1,067,464
Local currency | BNDES      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 946,984 696,329  
Funding 171,153 313,072  
Borrowing costs 0 (2,242)  
Lease 0 0  
Monetary variation  and exchange rate changes 5,405 0  
Inflation adjustment / update and incorporated interest - Capitalized 2,512 0  
Interest and fees paid (78,466) (55,806)  
Amortization (87,993) (76,469)  
Accrued interest 33,938 38,172  
Provision for interest rates and fees - Capitalized 48,294 33,768  
Borrowing costs expenses 209 160  
Borrowings and financing, ending 1,042,036 946,984 696,329
Local currency | Leasing      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 552,516 534,894  
Funding 0 0  
Borrowing costs 0 0  
Lease 24,693 32,111  
Monetary variation  and exchange rate changes 0 0  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid 0 0  
Amortization (15,593) (14,489)  
Accrued interest 0 0  
Provision for interest rates and fees - Capitalized 0 0  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 561,616 552,516 534,894
Local currency | Other      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 11,677 1,962  
Funding 0 10,014  
Borrowing costs 0 0  
Lease 0 0  
Monetary variation  and exchange rate changes 116 31  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (876) (905)  
Amortization (750) (655)  
Accrued interest 779 1,149  
Provision for interest rates and fees - Capitalized 31 81  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 10,977 11,677 1,962
Foreign currency      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 5,660,363 6,617,824  
Funding 196,508 831,301  
Borrowing costs (3,586) (13,690)  
Lease 0 0  
Monetary variation  and exchange rate changes 96,303 (1,090,465)  
Inflation adjustment / update and incorporated interest - Capitalized 45,590 45,154  
Interest and fees paid (199,398) (218,310)  
Amortization (330,592) (727,916)  
Accrued interest 137,001 132,091  
Provision for interest rates and fees - Capitalized 63,975 80,874  
Borrowing costs expenses 6,657 3,500  
Borrowings and financing, ending 5,672,821 5,660,363 6,617,824
Foreign currency | BID      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,811,664 2,194,353  
Funding 96,889 113,543  
Borrowing costs (2,497) (3,819)  
Lease 0 0  
Monetary variation  and exchange rate changes (15,193) (396,817)  
Inflation adjustment / update and incorporated interest - Capitalized 40,228 37,412  
Interest and fees paid (38,654) (42,429)  
Amortization (189,280) (133,063)  
Accrued interest 22,547 21,792  
Provision for interest rates and fees - Capitalized 16,803 20,100  
Borrowing costs expenses 750 592  
Borrowings and financing, ending 1,743,257 1,811,664 2,194,353
Foreign currency | BIRD      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 261,337 238,940  
Funding 35,710 59,983  
Borrowing costs 0 0  
Lease 0 0  
Monetary variation  and exchange rate changes 2,874 (40,213)  
Inflation adjustment / update and incorporated interest - Capitalized 2,837 1,971  
Interest and fees paid (4,049) (1,876)  
Amortization 0 0  
Accrued interest 3,662 1,916  
Provision for interest rates and fees - Capitalized 888 597  
Borrowing costs expenses 19 19  
Borrowings and financing, ending 303,278 261,337 238,940
Foreign currency | Deutsche Bank      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 480,244 0  
Funding 0 469,020  
Borrowing costs (720) (9,167)  
Lease 0 0  
Monetary variation  and exchange rate changes 7,335 19,845  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (31,774) 0  
Amortization 0 0  
Accrued interest 21,286 2,042  
Provision for interest rates and fees - Capitalized 11,925 2,804  
Borrowing costs expenses 3,584 546  
Borrowings and financing, ending 490,443 480,244 0
Foreign currency | Eurobonds      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,137,395 1,922,256  
Funding 0 0  
Borrowing costs 0 0  
Lease 0 0  
Monetary variation  and exchange rate changes 17,115 (334,915)  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (85,338) (128,283)  
Amortization 0 (437,752)  
Accrued interest 55,046 69,002  
Provision for interest rates and fees - Capitalized 29,529 50,239  
Borrowing costs expenses 821 922  
Borrowings and financing, ending 1,155,331 1,137,395 1,922,256
Foreign currency | JICA      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,617,215 1,756,969  
Funding 63,909 188,755  
Borrowing costs (287) (468)  
Lease 0 0  
Monetary variation  and exchange rate changes 82,563 (259,455)  
Inflation adjustment / update and incorporated interest - Capitalized 2,525 5,771  
Interest and fees paid (28,652) (33,799)  
Amortization (65,702) (73,854)  
Accrued interest 27,602 30,791  
Provision for interest rates and fees - Capitalized 1,115 2,362  
Borrowing costs expenses 160 143  
Borrowings and financing, ending 1,700,448 1,617,215 1,756,969
Foreign currency | BID 1983AB      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 341,951 505,306  
Funding 0 0  
Borrowing costs (82) (236)  
Lease 0 0  
Monetary variation  and exchange rate changes 1,609 (78,910)  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (10,931) (11,923)  
Amortization (75,610) (83,247)  
Accrued interest 6,858 6,548  
Provision for interest rates and fees - Capitalized 3,715 4,772  
Borrowing costs expenses 1,323 1,278  
Borrowings and financing, ending R$ 269,191 R$ 341,951 R$ 505,306