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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%