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Related Parties - Summary of Subsidiaries and Other Related Parties (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of related parties [line items] |  |  |  |  |
Loans assets |  | R$ 2,824 | R$ 490 |  |
Loans liabilities |  | 3,711 | 3,925 |  |
Receivables | [1] | 3,135 | 3,915 |  |
Payables | [1] | 193,124 | 289,988 |  |
Commercial transactions other payables |  |  | 298 |  |
Commercial transactions, sales and services |  | 3,533 | 7,920 | R$ 3,850 |
Commercial transactions purchases |  | 697,060 | 1,363,482 | 1,018,078 |
Expenses |  | 1,613 | 1,477 | 1,469 |
Quimica da bahia Industria e Comercio [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Loans liabilities | [2] | 2,875 | 2,875 |  |
Routeasy Serviços de Assessoria Logística Ltda. [Member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Loans assets | [3] | 2,334 |  |  |
Others [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Loans assets | [2] | 490 | 490 |  |
Loans liabilities | [2] | 836 | 1,050 |  |
Oxicap Industria de Gases [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] | 1,772 | 1,545 |  |
Commercial transactions, sales and services |  | 471 | 1 | 6 |
Commercial transactions purchases |  | 19,077 | 18,565 | 9,032 |
Refinaria De Petroleo Rigrandense [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] | 65,215 | 264,602 |  |
Commercial transactions purchases |  | 314,587 | 1,019,108 | 1,008,860 |
ConectCar Solucoes de Mobilidade Eletronica [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 151 | 739 |  |
Payables | [1] | 104 | 113 |  |
Commercial transactions, sales and services |  | 3,062 | 7,385 | 3,844 |
Commercial transactions purchases |  | 154 | 121 | 186 |
LA'7 Participaes e Empreend. Imob. Ltda. [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] |  | 124 |  |
Expenses |  | 1,613 | 1,477 | R$ 1,469 | [4]
Chevron (Thailand) Limited [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 166 | 1,333 |  |
Payables | [1] | 6 | 5,177 |  |
Commercial transactions purchases |  | 759 | 90,912 |  |
Chevron Brasil Oleos Basicos LTDA [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] | 6 |  |  |
Commercial transactions other payables |  |  | 6 |  |
Commercial transactions purchases |  |  | 6,336 |  |
Chevron Latin America Marketing LLC [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 118 | 86 |  |
Payables | [1] |  | 6 |  |
Commercial transactions, sales and services |  |  | 13 |  |
Commercial transactions purchases |  |  | 506 |  |
Chevron Lubricants Lanka PLC [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 3 |  |  |
Commercial transactions other payables |  |  | 285 |  |
Chevron Lubricants Oils S.A. [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 823 | 58 |  |
Commercial transactions, sales and services |  |  | 42 |  |
Chevron Marine Products [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | 1,873 | 506 |  |
Commercial transactions, sales and services |  |  | 104 |  |
Chevron Oronite Brasil LTDA. [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] |  | 1,193 |  |
Payables | [1] | 37,482 |  |  |
Commercial transactions, sales and services |  |  | 345 |  |
Commercial transactions purchases |  | 108,198 |  |  |
Chevron Products Company [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] | 87,754 | 16,302 |  |
Commercial transactions purchases |  | 247,578 | 212,915 |  |
Chevron Belgium NV [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Payables | [1] | 785 | 2,119 |  |
Commercial transactions purchases |  | 6,707 | 15,019 |  |
Chevron Petroleum CO Colombia [member] |  |  |  |  |
Summary of related parties [line items] |  |  |  |  |
Receivables | [1] | R$ 1 |  |  |
Commercial transactions other payables |  |  | 7 |  |
Commercial transactions, sales and services |  |  | R$ 30 |  |
[1] | Included in “domestic trade receivables”, “domestic trade payables” and “domestic trade payables – reverse factoring”, respectively.
[2] | Loans contracted have indefinite terms and do not contain remuneration clauses.
[3] | The loans contracted have a term of 36 months and can be extended by mutual agreement between the parties being remunerated by the DI plus a premium of 3% p.a.
[4] | Refers to rental contracts of 15 drugstores owned by LA’7 as of December 31, 2020 and 2019, a company of the former shareholders of Extrafarma that are current shareholders of Ultrapar.

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