| Reclassification adjustments on net movement in regulatory deferral account balances, before tax | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Reclassification adjustments on net movement in regulatory deferral account balances, before tax | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The amount of reclassification adjustments related to the net movement in regulatory deferral account balances, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Regulatory deferral account balances [member]; Other comprehensive income] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Ümberliigitamiskanded seoses reguleeritud hinnatingimustes müügitulu saldo netoliikumisega, enne tulumaksu | et | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Ümberliigitamiskannete summa seoses reguleeritud hinnatingimustes müügitulu saldo netoliikumisega, enne tulumaksu. Ümberliigitamiskanded on kasumisse (kahjumisse) ümberliigitatud summad, mida kajastati käesoleval või eelnevatel perioodidel muus koondkasumis. [Viide: reguleeritud hinnatingimustes müügitulu saldo [member]; muu koondkasum] | et | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |