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Investment - Summary of Amounts of Balance Sheets and Income Statements of Associates (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]        
Current assets R$ 25,024,181 R$ 17,489,071    
Non-current assets 13,986,176 18,761,091    
Current liabilities 12,640,230 9,240,841    
Non-current liabilities 15,900,887 17,099,056    
Equity 10,469,240 9,910,265 R$ 9,835,175 R$ 9,800,029
Net revenue from sales and services 109,732,842 74,058,056 [1] 83,004,729 [1]  
Costs, operating expenses and income 96,166 64,034 140,029  
Net income for the year 883,878 927,697 402,944  
Transportadora sulbrasileira de gas [member]        
Disclosure of associates [line items]        
Current assets 7,685 10,570    
Non-current assets 11,611 12,822    
Current liabilities 5,875 2,189    
Non-current liabilities 601 602    
Equity 12,820 20,601    
Net revenue from sales and services 15,126 14,295 12,348  
Costs, operating expenses and income (12,691) (6,475) (4,815)  
Net finance income and income and social contribution taxes (226) (437) (157)  
Net income for the year R$ 2,209 R$ 7,383 R$ 7,376  
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]        
Disclosure of associates [line items]        
Current assets R$ 90,156 R$ 65,136    
Non-current assets 70,496 77,339    
Current liabilities 44,408 26,116    
Non-current liabilities 7,562 7,994    
Equity 108,682 108,365    
Net revenue from sales and services 69,611 58,677 R$ 43,463  
Costs, operating expenses and income (68,390) (54,163) (36,791)  
Net finance income and income and social contribution taxes (904) (1,770) (2,483)  
Net income for the year R$ 317 R$ 2,744 R$ 4,189  
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 S.A. [member]        
Disclosure of associates [line items]        
Current assets R$ 14 R$ 47    
Non-current assets 10,151 10,146    
Current liabilities 0 0    
Non-current liabilities 3,109 3,109    
Equity 7,056 7,084    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income (28) (24) (84)  
Net finance income and income and social contribution taxes 0 0 12  
Net income for the year R$ (28) R$ (24) R$ (72)  
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]        
Disclosure of associates [line items]        
Current assets R$ 47 R$ 58    
Non-current assets 126 414    
Current liabilities 28 28    
Non-current liabilities 303 302    
Equity (158) 142    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income (239) (212) (213)  
Net finance income and income and social contribution taxes (61) (60) (57)  
Net income for the year R$ (300) R$ (272) R$ (270)  
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]        
Disclosure of associates [line items]        
Current assets R$ 568 R$ 352    
Non-current assets 1,804 2,196    
Current liabilities 158 154    
Non-current liabilities 724 890    
Equity 1,490 1,504    
Net revenue from sales and services 0 0 R$ 0  
Costs, operating expenses and income 18 396 285  
Net finance income and income and social contribution taxes (31) (39) (29)  
Net income for the year R$ (13) R$ 357 R$ 256  
Number of shares or units held 1,384,308 1,384,308 1,384,308  
% of capital held 33.00% 33.00% 33.00%  
[1] For further information see Note 3.c.3.