| Decrease through balances recovered in current period, regulatory deferral account debit balances | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Decrease through balances recovered in current period, regulatory deferral account debit balances | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease in regulatory deferral account debit balances resulting from balances recovered in the current period. [Refer: Regulatory deferral account debit balances] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Laghdú trí iarmhéideanna arna n‑aisghabháil le linn na tréimhse reatha, iarmhéideanna dochair cuntais iarchurtha rialála | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| An laghdú ar iarmhéideanna dochair cuntais iarchurtha rialála a leanann as iarmhéideanna arna n‑aisghabháil sa tréimhse reatha. [Féach: Iarmhéideanna dochair cuntais iarchurtha rialála] | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Laghdú trí iarmhéideanna arna n‑aisghabháil le linn na tréimhse reatha, iarmhéideanna dochair cuntais iarchurtha rialála | ga | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |