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17. Borrowings and financing (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning R$ 12,100,966 R$ 11,964,143  
Funding 1,640,130 1,012,315  
Borrowing costs (5,577) (4,743)  
Lease   24,693  
Monetary variation and exchange rate changes 982,072 159,087  
Inflation adjustment / update and incorporated interest - Capitalized 73,824 49,517  
Interest and fees paid (732,048) (676,087)  
Amortization (1,678,748) (1,098,558) R$ (1,535,312)
Accrued interest 563,902 426,781  
Interest rates and fees - Capitalized 198,061 233,341  
Borrowing costs expenses 10,214 10,477  
Borrowings and financing, ending 13,152,796 12,100,966 11,964,143
Local currency      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 6,428,145 6,303,780  
Funding 1,075,244 815,807  
Borrowing costs (3,021) (1,157)  
Lease   24,693  
Monetary variation and exchange rate changes 66,183 62,784  
Inflation adjustment / update and incorporated interest - Capitalized 10,367 3,927  
Interest and fees paid (491,312) (476,689)  
Amortization (1,111,806) (767,966)  
Accrued interest 372,440 289,780  
Interest rates and fees - Capitalized 133,540 169,366  
Borrowing costs expenses 3,607 3,820  
Borrowings and financing, ending 6,483,387 6,428,145 6,303,780
Local currency | Debentures      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 3,576,842 3,641,912  
Funding 750,000 500,000  
Borrowing costs (3,021) (1,157)  
Lease   0  
Monetary variation and exchange rate changes 62,676 51,768  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (259,175) (301,493)  
Amortization (905,080) (597,794)  
Accrued interest 226,810 176,780  
Interest rates and fees - Capitalized 34,409 103,215  
Borrowing costs expenses 3,400 3,611  
Borrowings and financing, ending 3,486,861 3,576,842 3,641,912
Local currency | Brazilian Federal Savings Bank      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,236,674 1,150,691  
Funding 194,244 144,654  
Borrowing costs 0 0  
Lease   0  
Monetary variation and exchange rate changes 0 5,495  
Inflation adjustment / update and incorporated interest - Capitalized 0 1,415  
Interest and fees paid (102,772) (95,854)  
Amortization (85,515) (65,836)  
Accrued interest 75,668 78,283  
Interest rates and fees - Capitalized 27,385 17,826  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 1,345,684 1,236,674 1,150,691
Local currency | BNDES      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,042,036 946,984  
Funding 131,000 171,153  
Borrowing costs 0 0  
Lease   0  
Monetary variation and exchange rate changes 3,438 5,405  
Inflation adjustment / update and incorporated interest - Capitalized 4,001 2,512  
Interest and fees paid (90,397) (78,466)  
Amortization (102,314) (87,993)  
Accrued interest 28,909 33,938  
Interest rates and fees - Capitalized 55,725 48,294  
Borrowing costs expenses 207 209  
Borrowings and financing, ending 1,072,605 1,042,036 946,984
Local currency | Leasing      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 561,616 552,516  
Funding 0 0  
Borrowing costs 0 0  
Lease   24,693  
Monetary variation and exchange rate changes 0 0  
Inflation adjustment / update and incorporated interest - Capitalized 6,366 0  
Interest and fees paid (38,196) 0  
Amortization (17,427) (15,593)  
Accrued interest 40,290 0  
Interest rates and fees - Capitalized 16,017 0  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 568,666 561,616 552,516
Local currency | Other      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 10,977 11,677  
Funding 0 0  
Borrowing costs 0 0  
Lease   0  
Monetary variation and exchange rate changes 69 116  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (772) (876)  
Amortization (1,470) (750)  
Accrued interest 763 779  
Interest rates and fees - Capitalized 4 31  
Borrowing costs expenses 0 0  
Borrowings and financing, ending 9,571 10,977 11,677
Foreign currency      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 5,672,821 5,660,363  
Funding 564,886 196,508  
Borrowing costs (2,556) (3,586)  
Lease   0  
Monetary variation and exchange rate changes 915,889 96,303  
Inflation adjustment / update and incorporated interest - Capitalized 63,457 45,590  
Interest and fees paid (240,736) (199,398)  
Amortization (566,942) (330,592)  
Accrued interest 191,462 137,001  
Interest rates and fees - Capitalized 64,521 63,975  
Borrowing costs expenses 6,607 6,657  
Borrowings and financing, ending 6,669,409 5,672,821 5,660,363
Foreign currency | BID      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,743,257 1,811,664  
Funding 484,690 96,889  
Borrowing costs (2,365) (2,497)  
Lease   0  
Monetary variation and exchange rate changes 237,433 (15,193)  
Inflation adjustment / update and incorporated interest - Capitalized 53,208 40,228  
Interest and fees paid (55,391) (38,654)  
Amortization (130,520) (189,280)  
Accrued interest 26,910 22,547  
Interest rates and fees - Capitalized 41,878 16,803  
Borrowing costs expenses 885 750  
Borrowings and financing, ending 2,399,985 1,743,257 1,811,664
Foreign currency | BIRD      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 303,278 261,337  
Funding 0 35,710  
Borrowing costs 0 0  
Lease   0  
Monetary variation and exchange rate changes 48,279 2,874  
Inflation adjustment / update and incorporated interest - Capitalized 3,462 2,837  
Interest and fees paid (7,607) (4,049)  
Amortization 0 0  
Accrued interest 6,945 3,662  
Interest rates and fees - Capitalized 2,044 888  
Borrowing costs expenses 19 19  
Borrowings and financing, ending 356,420 303,278 261,337
Foreign currency | Deutsche Bank      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 496,726 485,090  
Funding 0 0  
Borrowing costs 0 (720)  
Lease   0  
Monetary variation and exchange rate changes 62,918 7,335  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (35,207) (31,774)  
Amortization (268,508) 0  
Accrued interest 28,862 21,286  
Interest rates and fees - Capitalized 4,454 11,925  
Borrowing costs expenses 3,627 3,584  
Borrowings and financing, ending 292,872 496,726 485,090
Foreign currency | Eurobonds      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,158,642 1,141,649  
Funding 0 0  
Borrowing costs 0 0  
Lease   0  
Monetary variation and exchange rate changes 198,380 17,115  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (97,952) (85,338)  
Amortization 0 0  
Accrued interest 85,072 55,046  
Interest rates and fees - Capitalized 13,448 29,529  
Borrowing costs expenses 822 821  
Borrowings and financing, ending 1,358,412 1,158,642 1,141,649
Foreign currency | JICA      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 1,700,448 1,617,215  
Funding 80,196 63,909  
Borrowing costs (191) (287)  
Lease   0  
Monetary variation and exchange rate changes 329,638 82,563  
Inflation adjustment / update and incorporated interest - Capitalized 6,787 2,525  
Interest and fees paid (33,519) (28,652)  
Amortization (82,608) (65,702)  
Accrued interest 33,992 27,602  
Interest rates and fees - Capitalized 1,209 1,115  
Borrowing costs expenses 176 160  
Borrowings and financing, ending 2,036,128 1,700,448 1,617,215
Foreign currency | BID 1983AB      
SummaryOfBorrowingsAndFinancingLineItems [Line Items]      
Borrowings and financing, beginning 270,470 343,588  
Funding 0 0  
Borrowing costs 0 (82)  
Lease   0  
Monetary variation and exchange rate changes 39,241 1,609  
Inflation adjustment / update and incorporated interest - Capitalized 0 0  
Interest and fees paid (11,060) (10,931)  
Amortization (85,306) (75,610)  
Accrued interest 9,681 6,858  
Interest rates and fees - Capitalized 1,488 3,715  
Borrowing costs expenses 1,078 1,323  
Borrowings and financing, ending R$ 225,592 R$ 270,470 R$ 343,588