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Investment - Summary of Amounts of Balance Sheets and Income Statements of Associates (Detail) - BRL (R$) shares in Thousands, R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of associates [line items] |  |  |  |
Current assets | R$ 15,058,055 | R$ 16,211,707 |  |
Non-current assets | 16,137,417 | 14,287,688 |  |
Current liabilities | 5,195,069 | 6,336,798 |  |
Non-current liabilities | 16,165,228 | 14,362,568 |  |
Equity | 9,835,175 | 9,800,029 | R$ 9,624,038 | R$ 8,476,050
Net revenue from sales and services | 89,297,975 | 90,697,983 | 79,230,014 |
Costs, operating expenses and income | 179,625 | 57,533 | 59,360 |
Net income (loss) | 402,944 | 1,132,320 | 1,525,865 |
Transportadora sulbrasileira de gas [member] |  |  |  |
Summary of associates [line items] |  |  |  |
Current assets | 12,172 | 7,803 |  |
Non-current assets | 14,041 | 15,254 |  |
Current liabilities | 2,944 | 3,963 |  |
Non-current liabilities | 626 | 332 |  |
Equity | 22,643 | 18,762 |  |
Net revenue from sales and services | 12,348 | 10,595 | 10,522 |
Costs, operating expenses and income | (4,815) | (7,957) | (5,649) |
Net financial income and income and social contribution taxes | (157) | (211) |  |
Net income (loss) | R$ 7,376 | R$ 2,427 | R$ 4,873 |
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 [member] |  |  |  |
Summary of associates [line items] |  |  |  |
Current assets | R$ 45,178 | R$ 38,714 |  |
Non-current assets | 84,705 | 85,395 |  |
Current liabilities | 11,041 | 9,777 |  |
Non-current liabilities | 9,634 | 8,888 |  |
Equity | 109,208 | 105,444 |  |
Net revenue from sales and services | 43,463 | 53,288 | R$ 52,709 |
Costs, operating expenses and income | (36,791) | (43,814) | (40,769) |
Net financial income and income and social contribution taxes | (2,483) | (3,453) | (2,144) |
Net income (loss) | R$ 4,189 | R$ 6,021 | R$ 9,796 |
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 [member] |  |  |  |
Summary of associates [line items] |  |  |  |
Current assets | R$ 71 | R$ 51 |  |
Non-current assets | 10,147 | 10,238 |  |
Current liabilities | 0 |  |  |
Non-current liabilities | 3,110 | 3,109 |  |
Equity | 7,108 | 7,180 |  |
Net revenue from sales and services | 0 |  |  |
Costs, operating expenses and income | (84) | (78) | R$ (90) |
Net financial income and income and social contribution taxes | 12 | 22 | (31) |
Net income (loss) | R$ (72) | R$ (56) | R$ (121) |
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 [member] |  |  |  |
Summary of associates [line items] |  |  |  |
Current assets | R$ 40 | R$ 19 |  |
Non-current assets | 703 | 990 |  |
Current liabilities | 25 | 21 |  |
Non-current liabilities | 302 | 302 |  |
Equity | 416 | 686 |  |
Net revenue from sales and services | 0 |  |  |
Costs, operating expenses and income | (213) | (266) | R$ 673 |
Net financial income and income and social contribution taxes | (57) | (69) | 179 |
Net income (loss) | R$ (270) | R$ (335) | R$ 852 |
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 [member] |  |  |  |
Summary of associates [line items] |  |  |  |
Current assets | R$ 151 | R$ 64 |  |
Non-current assets | 2,440 | 2,791 |  |
Current liabilities | 34 | 123 |  |
Non-current liabilities | 1,167 | 1,334 |  |
Equity | 1,390 | 1,398 |  |
Net revenue from sales and services | 0 |  |  |
Costs, operating expenses and income | 285 | 399 | R$ 628 |
Net financial income and income and social contribution taxes | (29) | (27) | 15 |
Net income (loss) | R$ 256 | R$ 372 | R$ 643 |
Number of shares or units held | 1,384,308 | 1,384,308 | 1,384,308 |
% of capital held | 33.00% | 33.00% | 33.00% |

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