| Other environment related contingent liability [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for an environment-related contingent liability that the entity does not separately disclose in the same statement or note. [Refer: Contingent liabilities [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Outro passivo contingente relacionado com o ambiente [member] | pt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Este membro representa um passivo contingente relacionado com o ambiente não divulgado separadamente pela entidade na mesma demonstração ou nota. [Consultar: Passivos contingentes [member]] | pt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |