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Investments in subsidiaries, joint ventures and associates - Summary of Amounts of Balance Sheets and Income Statements of Associates (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]        
Current assets R$ 18,648,895 R$ 18,564,600    
Non-current assets 19,603,079 17,876,403    
Current liabilities 11,229,658 12,766,252    
Non-current liabilities 12,992,490 11,499,783    
Equity 14,029,826 12,174,968 R$ 10,469,240 R$ 9,910,265
Net revenue 126,048,701 143,634,708 109,732,842  
Costs, operating expenses and income (602,865) (514,522) 96,166  
Net income (loss) for the year 2,517,753 1,840,069 883,878  
Transportadora sulbrasileira de gas [member]        
Disclosure of associates [line items]        
Current assets 10,827 8,598    
Non-current assets 9,329 10,420    
Current liabilities 3,642 2,824    
Non-current liabilities 602 601    
Equity 15,912 [1] 15,593    
Net revenue 16,212 18,250 15,126  
Costs, operating expenses and income (8,145) (7,593) (12,691)  
Net finance income and income and social contribution taxes 186 76 (226)  
Net income (loss) for the year R$ 8,253 [1] R$ 10,733 R$ 2,209  
Number of shares or units held 20,124,996 20,124,996 20,124,996  
Interest in share capital - % in associates 25.00% [1] 25.00% 25.00%  
Oxicap Industria de Gases [member]        
Disclosure of associates [line items]        
Net revenue     R$ 69,611  
Costs, operating expenses and income     (68,390)  
Net finance income and income and social contribution taxes     (904)  
Net income (loss) for the year     R$ 317  
Number of shares or units held     1,987  
Interest in share capital - % in associates     15.00%  
Quimica da Bahia Industria e Comercio S.A. [member]        
Disclosure of associates [line items]        
Net revenue     R$ 0  
Costs, operating expenses and income     (28)  
Net finance income and income and social contribution taxes     0  
Net income (loss) for the year     R$ (28)  
Number of shares or units held     1,493,120  
Interest in share capital - % in associates     50.00%  
Metalurgica plus [member]        
Disclosure of associates [line items]        
Current assets R$ 5 R$ 6    
Non-current assets 0 0    
Current liabilities 32 29    
Non-current liabilities 742 448    
Equity (769) [2] (471)    
Net revenue 0 0 R$ 0  
Costs, operating expenses and income (263) (245) (239)  
Net finance income and income and social contribution taxes (35) (69) (61)  
Net income (loss) for the year R$ (298) [2] R$ (314) R$ (300)  
Number of shares or units held 3,000 3,000 3,000  
Interest in share capital - % in associates 33.00% [2] 33.00% 33.00%  
Plenogas distribuidora de gas [member]        
Disclosure of associates [line items]        
Current assets R$ 828 R$ 617    
Non-current assets 1,269 1,949    
Current liabilities 218 167    
Non-current liabilities 390 555    
Equity 1,489 [2] 1,844    
Net revenue 0 0 R$ 0  
Costs, operating expenses and income 378 356 18  
Net finance income and income and social contribution taxes (2) (3) (31)  
Net income (loss) for the year R$ 376 [2] R$ 353 R$ (13)  
Number of shares or units held 1,384,308 1,384,308 1,384,308  
Interest in share capital - % in associates 33.00% [2] 33.00% 33.00%  
[1] The subsidiary IPP holds an interest in Transportadora Sulbrasileira de Gás S.A. (“TSB”), which is primarily engaged in natural gas transportation services.
[2] The subsidiary Cia. Ultragaz holds an interest in Metalúrgica Plus S.A. (“Metalplus”), which is primarily engaged in the manufacture and trading of LPG containers and has interest in Plenogás Distribuidora de Gás S.A. (“Plenogás”), which is primarily engaged in the marketing of LPG containers. Currently, the associates have their operational activities suspended.