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11. Investments (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfAssociatesLineItems [Line Items]      
Current assets R$ 15,201,291 R$ 13,011,796  
Non-current assets 13,139,031 11,147,874  
Current liabilities 7,013,988 5,486,946  
Non-current liabilities 11,605,502 10,114,166  
Shareholders’ equity 9,720,832 8,558,558  
Net revenue from sales and services 80,007,422 77,352,955 R$ 75,655,274
Costs, operating expenses and income 2,866,920 3,105,710 2,961,530
Net income (loss) 1,573,868 1,570,618 1,512,972
Transportadora Sulbrasileira de Gas      
SummaryOfAssociatesLineItems [Line Items]      
Current assets 11,218 7,524 5,175
Non-current assets 16,464 17,570 18,773
Current liabilities 1,960 759 644
Non-current liabilities 332 332 332
Shareholders’ equity 25,390 24,003 22,972
Net revenue from sales and services 10,522 9,955 10,628
Costs, operating expenses and income (5,649) (5,194) (4,703)
Net financial income and income and social contribution taxes 0 63 (7)
Net income (loss) R$ 4,873 R$ 4,824 R$ 5,918
Number of shares or units held 20,124,996 20,124,996 20,124,996
% of capital held 25.00% 25.00% 25.00%
Oxicap Industria de Gases      
SummaryOfAssociatesLineItems [Line Items]      
Current assets R$ 45,061 R$ 28,358 R$ 13,390
Non-current assets 74,612 70,034 79,203
Current liabilities 12,338 7,125 8,682
Non-current liabilities 7,920 5,226 4,371
Shareholders’ equity 99,424 86,041 79,540
Net revenue from sales and services 52,709 52,751 42,799
Costs, operating expenses and income (40,769) (39,539) (14,050)
Net financial income and income and social contribution taxes (2,144) (6,837) (9,973)
Net income (loss) R$ 9,796 R$ 6,375 R$ 18,776
Number of shares or units held 1,987 1,987 1,987
% of capital held 15.00% 15.00% 15.00%
Quimica da Bahia Industria e Comercio      
SummaryOfAssociatesLineItems [Line Items]      
Current assets R$ 67 R$ 220 R$ 73
Non-current assets 10,278 10,246 10,403
Current liabilities 0 1 0
Non-current liabilities 3,110 3,109 3,109
Shareholders’ equity 7,235 7,356 7,367
Net revenue from sales and services 0 0 0
Costs, operating expenses and income (90) (60) (34)
Net financial income and income and social contribution taxes (31) 49 49
Net income (loss) R$ (121) R$ (11) R$ 15
Number of shares or units held 1,493,120 1,493,120 1,493,120
% of capital held 50.00% 50.00% 50.00%
Metalurgica Plus      
SummaryOfAssociatesLineItems [Line Items]      
Current assets R$ 175 R$ 169 R$ 759
Non-current assets 1,695 1,682 1,681
Current liabilities 422 21 403
Non-current liabilities 427 1,616 1,708
Shareholders’ equity 1,021 214 329
Net revenue from sales and services 0 0 0
Costs, operating expenses and income 673 (189) (172)
Net financial income and income and social contribution taxes 179 (19) 8
Net income (loss) R$ 852 R$ (208) R$ (164)
Number of shares or units held 3,000 3,000 3,000
% of capital held 33.00% 33.00% 33.00%
Plenogas Distribuidora de Gas      
SummaryOfAssociatesLineItems [Line Items]      
Current assets R$ 505 R$ 1,178 R$ 691
Non-current assets 2,821 2,821 2,830
Current liabilities 93 53 101
Non-current liabilities 1,500 1,667 1,777
Shareholders’ equity 1,733 2,279 1,643
Net revenue from sales and services 0 0 0
Costs, operating expenses and income 628 574 1,792
Net financial income and income and social contribution taxes 15 68 14
Net income (loss) R$ 643 R$ 642 R$ 1,806
Number of shares or units held 1,384,308 1,384,308 1,384,308
% of capital held 33.00% 33.00% 33.00%