| 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 |
| Omklassifikationsreguleringer vedrørende nettobevægelse i saldi for regulatoriske aktiver og forpligtelser før skat | da | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Den beløbsmæssige størrelse af omklassifikationsreguleringer vedrørende nettobevægelsen i saldi for regulatoriske aktiver og forpligtelser før skat. Omklassifikationsreguleringer er beløb, der omklassificeres til resultatet i det aktuelle regnskabsår, og som blev indregnet i øvrig totalindkomst i det aktuelle eller tidligere regnskabsår. [Reference: saldi for regulatoriske aktiver og forpligtelser [member], øvrig totalindkomst] | da | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |