| Decrease through balances reversed in current period, regulatory deferral account credit balances | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Decrease through balances reversed in current period, regulatory deferral account credit balances | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease in regulatory deferral account credit balances resulting from balances reversed in the current period. [Refer: Regulatory deferral account credit balances] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Tnaqqis permezz tal-bilanċi mreġġa’ lura fil-perjodu kurrenti, bilanċi ta’ kreditu tal-kont ta’ differiment regolatorju | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| It-tnaqqis fil-bilanċi ta’ kreditu tal-kont ta’ differiment regolatorju li jirriżulta mill-bilanċi mreġġa’ lura fil-perjodu kurrenti. [Refer: Bilanċi tal-kreditu ta’ kont ta’ differiment regolatorju] | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Tnaqqis permezz tal-bilanċi mreġġa’ lura fil-perjodu kurrenti, bilanċi ta’ kreditu tal-kont ta’ differiment regolatorju | mt | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |