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Related Parties - Summary of Subsidiaries and Other Related Parties (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]      
Assets R$ 57,387 R$ 35,035  
Liabilities 187,036 150,570  
Trade receivables (Note 5) 8,662 3,143 R$ 0
Other receivables 416 0 0
Trade payables (Note 16) 183,520 147,452 0
Related parties assets 48,309 31,892  
Related parties liabilities 3,516 3,118  
Sales and services provided 21,125 14,779 16,090
Purchases (1,423,614) (1,083,065) (1,211,826)
Operating result - Sales/(Purchases) (1,402,489) (1,068,286) 1,195,736
Transactions with Joint Ventures [Member] | Refinaria De Petroleo Rigrandense S.A. [member]      
Disclosure of transactions between related parties [line items]      
Assets 0 0  
Liabilities 9,846 29,278  
Operating result - Sales/(Purchases) (457,885) (510,510) (336,781)
Transactions with Joint Ventures [Member] | Latitude Logística Portuária S.A [member]      
Disclosure of transactions between related parties [line items]      
Assets 10,862 11,393  
Liabilities 0 20  
Operating result - Sales/(Purchases) 0 0 0
Transactions with Joint Ventures [Member] | Navegantes Logística Portuária S.A.      
Disclosure of transactions between related parties [line items]      
Assets 29,406 13,703  
Liabilities 0 0  
Operating result - Sales/(Purchases) 0 0 0
Transactions with Joint Ventures [Member] | Others      
Disclosure of transactions between related parties [line items]      
Assets 7,943 6,874  
Liabilities 2,875 2,917  
Operating result - Sales/(Purchases) 851 571 784
Transactions with Associates [Member] | Hidrovias do Brasil S.A.      
Disclosure of transactions between related parties [line items]      
Assets 416 0  
Liabilities 0 0  
Operating result - Sales/(Purchases) 0 0 0
Transactions with Other Related Parties [Member] | Chevron Oronite Brasil Ltda. [member]      
Disclosure of transactions between related parties [line items]      
Assets [1] 0 0  
Liabilities [1] 13,434 53,466  
Operating result - Sales/(Purchases) [1] (195,925) (175,053) (162,006)
Transactions with Other Related Parties [Member] | Chevron Products Company [member]      
Disclosure of transactions between related parties [line items]      
Assets [1] 0 0  
Liabilities [1] 159,432 63,263  
Operating result - Sales/(Purchases) [1] (745,812) (370,137) (699,154)
Transactions with Other Related Parties [Member] | Others [member]      
Disclosure of transactions between related parties [line items]      
Assets 8,760 3,065  
Liabilities 1,449 1,626  
Operating result - Sales/(Purchases) R$ (3,718) R$ (13,157) R$ 1,421
[1] Non-controlling shareholders and other related parties of Iconic.