| Description of basis on which regulatory deferral account balances are recognised and derecognised, and how they are measured initially and subsequently | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The description of the basis on which regulatory deferral account balances are recognised and derecognised, and how they are measured initially and subsequently, including how regulatory deferral account balances are assessed for recoverability and how any impairment loss is allocated. [Refer: Regulatory deferral account balances [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Descrição da base de reconhecimento e desreconhecimento dos saldos dos diferimentos regulamentares e do modo de mensuração inicial e posterior | pt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| A descrição da base de reconhecimento e desreconhecimento dos saldos dos diferimentos regulamentares e do modo de mensuração inicial e posterior, incluindo o modo de avaliação dos saldos dos diferimentos regulamentares para recuperabilidade e o modo de atribuição de qualquer perda por imparidade. [Consultar: Saldos dos diferimentos regulamentares [member]] | pt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |