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Income and Social Contribution Taxes - Summary of Tax Incentives (Detail)
 12 Months Ended
Dec. 31, 2020
Bahiana Distribuidora De Gas Ltda [member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Bahiana Distribuidora de Gás Ltda.
Bahiana Distribuidora De Gas Ltda [member] | Mataripe Base [member]  
Summary of income and social contribution taxes [line items]  
Business Units Mataripe base
Incentive - % 75.00%
Expiration 2024
Bahiana Distribuidora De Gas Ltda [member] | Caucaia Base [member]  
Summary of income and social contribution taxes [line items]  
Business Units Caucaia base
Incentive - % 75.00%
Expiration 2025
Bahiana Distribuidora De Gas Ltda [member] | Juazeiro base [member]  
Summary of income and social contribution taxes [line items]  
Business Units Juazeiro base
Incentive - % 75.00%
Expiration 2026
Bahiana Distribuidora De Gas Ltda [member] | Aracaju Base [member]  
Summary of income and social contribution taxes [line items]  
Business Units Aracaju base
Incentive - % 75.00%
Expiration 2027
Bahiana Distribuidora De Gas Ltda [member] | Suape Base [member]  
Summary of income and social contribution taxes [line items]  
Business Units Suape base
Incentive - % 75.00%
Expiration 2027
Terminal Quimico De Aratu SATequimar [member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Terminal Químico de Aratu S.A. – Tequimar
Terminal Quimico De Aratu SATequimar [member] | Suape terminal [Member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Suape terminal [1]
Incentive - % 75.00%
Expiration 2020
Terminal Quimico De Aratu SATequimar [member] | Aratu Terminal [member]  
Summary of income and social contribution taxes [line items]  
Business Units Aratu terminal
Incentive - % 75.00%
Expiration 2022
Terminal Quimico De Aratu SATequimar [member] | Itaqui Terminal [member]  
Summary of income and social contribution taxes [line items]  
Business Units Itaqui terminal
Incentive - % 75.00%
Expiration 2025
Oleoquímica Industriae Comércio De Produtos Químicos Ltda [member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Oleoquímica Indústria e Comércio de Produtos Químicos Ltda.
Oleoquímica Industriae Comércio De Produtos Químicos Ltda [member] | Camacari Plant [member]  
Summary of income and social contribution taxes [line items]  
Business Units Camaçari plant
Incentive - % 75.00%
Expiration 2021
Oxiteno S A Industria e Comercio [member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Oxiteno S.A. Indústria e Comércio [2]
Oxiteno S A Industria e Comercio [member] | Camacari Plant [member]  
Summary of income and social contribution taxes [line items]  
Business Units Camaçari plant [2]
Incentive - % 75.00% [2]
Expiration 2026 [2]
Empresa Carioca de Produtos Quimicos S A [member]  
Summary of income and social contribution taxes [line items]  
Subsidiary Empresa Carioca de Produtos Químicos S.A. [3]
Empresa Carioca de Produtos Quimicos S A [member] | Camacari Plant [member]  
Summary of income and social contribution taxes [line items]  
Business Units Camaçari plant [3]
Incentive - % 75.00% [3]
Expiration 2026 [3]
[1] Based on the legislation in force the enterprise belongs to the sectors identified as priorities for the development of the Northeast region of Brazil.CombinedwithTequimar'ssuccessful track record in meeting the requirements for maintaining and renewing the incentive, as well as in the factthatseveral investments have been made in the modernization of the production process of the unit that is the object of the benefit –SuapeTerminal, therequest for theextension of the incentive for another10yearswill be filed in2021at SUDENE.Therenewalrequest is usually made in the yearafter the year in whichthe incentive expires and generates retroactive effectsas ofJanuary of the year in which the request is filed.
[2] The request forrenewalof theOleoquímicaincentive will be filed in2022,for the same reasonsdescribed in note1above.
[3] The request to transfer the right to reduce the IRPJ toOxitenoS.A.wassubmitted to SUDENEand waits decision.