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Related Parties - Summary of Subsidiaries and Other Related Parties (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Loans, Assets R$ 31,892 [1] R$ 0 [2]  
Loans, Liabilities 3,118 [1] 3,492 [2]  
Commercial transactions, Receivables 3,143 2,759  
Commercial transactions, Trade payables 147,452 259,644  
Trading transactions, Sales and services provided 14,779 16,090 R$ 28,080
Trading transactions, Purchases 1,083,065 1,211,826 1,568,707
Quimica da Bahia Industria e Comercio S.A. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1] 0 [2]  
Loans, Liabilities 2,875 [1] 2,875 [2]  
Commercial transactions, Receivables 0 0  
Commercial transactions, Trade payables 0 0  
Trading transactions, Sales and services provided 0 0  
Trading transactions, Purchases 0 0  
Refinaria De Petroleo Rigrandense S.A. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1] 0 [2]  
Loans, Liabilities 0 [1] 0 [2]  
Commercial transactions, Receivables 0 0  
Commercial transactions, Trade payables 29,278 26,062  
Trading transactions, Sales and services provided 0 0 0
Trading transactions, Purchases 510,510 336,781 619,785
União Vopak Armazéns Gerais Ltda. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1] 0 [2]  
Loans, Liabilities 0 [1] 0 [2]  
Commercial transactions, Receivables 32 61  
Commercial transactions, Trade payables 0 0  
Trading transactions, Sales and services provided 571 784 1,402
Trading transactions, Purchases 0 0 0
Latitude Logística Portuária S.A [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 11,393 [1] 0 [2]  
Loans, Liabilities 0 [1] 0 [2]  
Commercial transactions, Receivables 0 3  
Commercial transactions, Trade payables 20 346  
Trading transactions, Sales and services provided 0 0  
Trading transactions, Purchases 0 0  
Nordeste Logística I S.A. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 6,842 [1] 0 [2]  
Loans, Liabilities 0 [1] 0 [2]  
Commercial transactions, Receivables 0 0  
Commercial transactions, Trade payables 24 22  
Trading transactions, Sales and services provided 0 0  
Trading transactions, Purchases 0 0  
Nordeste Logística III S.A. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1] 0 [2]  
Loans, Liabilities 0 [1] 0 [2]  
Commercial transactions, Receivables 0 0  
Commercial transactions, Trade payables 18 17  
Trading transactions, Sales and services provided 0 0  
Trading transactions, Purchases 0 0  
Chevron (Thailand) Limited [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 0 [3] 0 [4]  
Commercial transactions, Trade payables 0 [3] 113 [4]  
Trading transactions, Sales and services provided 483 [3] 0 [4] 675 [5]
Trading transactions, Purchases 0 [3] 832 [4] 1,072 [5]
Chevron Latin America Marketing LLC [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 73 [3] 34 [4]  
Commercial transactions, Trade payables 0 [3] 0 [4]  
Trading transactions, Sales and services provided 0 [3] 0 [4]  
Trading transactions, Purchases 0 [3] 0 [4]  
Chevron Lubricants Oils S.A. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 353 [3] 403 [4]  
Commercial transactions, Trade payables 0 [3] 0 [4]  
Trading transactions, Sales and services provided 353 [3] 930 [4] 786 [5]
Trading transactions, Purchases 0 [3] 0 [4] 0 [5]
Chevron Marine Products [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 2,495 [3] 1,950 [4]  
Commercial transactions, Trade payables 0 [3] 0 [4]  
Trading transactions, Sales and services provided 13,228 [3] 14,068 [4] 24,583 [5]
Trading transactions, Purchases 0 [3] 0 [4] 0 [5]
Chevron Oronite Brasil Ltda. [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 0 [3] 0 [4]  
Commercial transactions, Trade payables 53,466 [3] 53,912 [4]  
Trading transactions, Sales and services provided 0 [3] 0 [4] 78 [5]
Trading transactions, Purchases 175,053 [3] 162,006 [4] 150,878 [5]
Chevron Products Company [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 0 [3] 0 [4]  
Commercial transactions, Trade payables 63,263 [3] 178,846 [4]  
Trading transactions, Sales and services provided 0 [3] 0 [4] 0 [5]
Trading transactions, Purchases 370,137 [3] 699,154 [4] 789,452 [5]
Chevron Belgium NV [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 0 [3] 0 [4]  
Commercial transactions, Trade payables 1,346 [3] 326 [4]  
Trading transactions, Sales and services provided 0 [3] 0 [4] 0 [5]
Trading transactions, Purchases 27,306 [3] 13,053 [4] 7,520 [5]
Chevron Petroleum CO Colombia [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets [2],[4]   0  
Loans, Liabilities [2],[4]   0  
Commercial transactions, Receivables [4]   220  
Commercial transactions, Trade payables [4]   0  
Trading transactions, Sales and services provided   220 [4] 392 [5]
Trading transactions, Purchases   0 [4] 0 [5]
Chevron Lubricants Lanka PLC [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1],[3] 0 [2],[4]  
Loans, Liabilities 0 [1],[3] 0 [2],[4]  
Commercial transactions, Receivables 144 [3] 88 [4]  
Commercial transactions, Trade payables 0 [3] 0 [4]  
Trading transactions, Sales and services provided 144 [3] 88 [4] 164 [5]
Trading transactions, Purchases 0 [3] 0 [4] R$ 0 [5]
Others [member]      
Disclosure of transactions between related parties [line items]      
Loans, Assets 0 [1] 0 [2]  
Loans, Liabilities 243 [1] 617 [2]  
Commercial transactions, Receivables 0 0  
Commercial transactions, Trade payables 0 0  
Trading transactions, Sales and services provided 0 0  
Trading transactions, Purchases 0 R$ 0  
Navegantes Logística Portuária S.A.      
Disclosure of transactions between related parties [line items]      
Loans, Assets [1] 13,657    
Loans, Liabilities [1] 0    
Commercial transactions, Receivables 46    
Commercial transactions, Trade payables 0    
Trading transactions, Sales and services provided 0    
Trading transactions, Purchases 0    
Chevron Brasil Óleo e Gás Ltda.      
Disclosure of transactions between related parties [line items]      
Loans, Assets [1],[3] 0    
Loans, Liabilities [1],[3] 0    
Commercial transactions, Receivables [3] 0    
Commercial transactions, Trade payables [3] 37    
Trading transactions, Sales and services provided [3] 0    
Trading transactions, Purchases [3] 0    
MLF Holding Ltda.      
Disclosure of transactions between related parties [line items]      
Loans, Assets [1],[6] 0    
Loans, Liabilities [1],[6] 0    
Commercial transactions, Receivables [6] 0    
Commercial transactions, Trade payables [6] 0    
Trading transactions, Sales and services provided [6] 0    
Trading transactions, Purchases [6] R$ 59    
[1] Loans contracted have indefinite terms and do not contain remuneration clauses.
[2] Loans contracted have indefinite terms and do not contain remuneration clauses.
[3] Non-controlling shareholders and other related parties of Iconic.
[4] Non-controlling shareholders and other related parties of Iconic.
[5] Non-controlling shareholders and other related parties of Iconic.
[6] Non-controlling shareholders and other related parties of Serra Diesel.