| Net movement in regulatory deferral account balances related to profit or loss and net movement in related deferred tax | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total net movement in regulatory deferral account balances related to profit or loss and net movement in related deferred tax | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of the net movement in regulatory deferral account balances related to profit or loss and the net movement in related deferred tax. [Refer: Net movement in regulatory deferral account balances related to profit or loss; Net movement in deferred tax arising from regulatory deferral account balances related to profit or loss] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Glanghluaiseacht in iarmhéideanna cuntais iarchurtha rialála a bhaineann le brabús nó caillteanas agus glanghluaiseacht i gcáin iarchurtha ghaolmhar | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Méid na glanghluaiseachta in iarmhéideanna cuntais iarchurtha rialála a bhaineann le brabús nó caillteanas agus an ghlanghluaiseacht i gcáin iarchurtha ghaolmhar. [Féach: Glanghluaiseacht in iarmhéideanna cuntais iarchurtha rialála a bhaineann le brabús nó caillteanas; Glanghluaiseacht i gcáin iarchurtha a eascraíonn as iarmhéideanna cuntais iarchurtha rialála a bhaineann le brabús nó caillteanas] | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Glanghluaiseacht iomlán in iarmhéideanna cuntais iarchurtha rialála a bhaineann le brabús nó caillteanas agus glanghluaiseacht i gcáin iarchurtha ghaolmhar | ga | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |