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9. Income and Social Contribution Taxes (Details 4) - Subsidiary
 12 Months Ended
Dec. 31, 2017
SummaryOfIncomeAndSocialContributionTaxesLineItems [Line Items]  
Subsidiary  Bahiana Distribuidora de Gás Ltda.
Units Aracaju base (1)
Incentive percentage 75.00%
Expiration 2017
Subsidiary  Bahiana Distribuidora de Gás Ltda.
Units Suape base
Incentive percentage 75.00%
Expiration 2018
Subsidiary  Bahiana Distribuidora de Gás Ltda.
Units Mataripe base
Incentive percentage 75.00%
Expiration 2024
Subsidiary  Bahiana Distribuidora de Gás Ltda.
Units Caucaia base
Incentive percentage 75.00%
Expiration 2025
Subsidiary Terminal Químico de Aratu S.A. – Tequimar
Units Suape terminal
Incentive percentage 75.00%
Expiration 2020
Subsidiary Terminal Químico de Aratu S.A. – Tequimar
Units Aratu terminal
Incentive percentage 75.00%
Expiration 2022
Subsidiary Terminal Químico de Aratu S.A. – Tequimar
Units Itaqui terminal
Incentive percentage 75.00%
Expiration 2025
Subsidiary Oleoquímica Indústria e Comércio de Produtos Químicos Ltda.
Units Camaçari plant
Incentive percentage 75.00%
Expiration 2021
Subsidiary Oxiteno Nordeste S.A. Indústria e Comércio
Units Camaçari plant (2)
Incentive percentage 75.00%
Expiration 2026
Subsidiary Empresa Carioca de Produtos Químicos S.A.
Units Camaçari plant (3)
Incentive percentage 75.00%
Expiration 2026