| Other comprehensive income, net of tax, net movement in regulatory deferral account balances related to items that will be reclassified to profit or loss | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Other comprehensive income, net of tax, net movement in regulatory deferral account balances related to items that will be reclassified to profit or loss | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of other comprehensive income, net of tax, related to the net movement in regulatory deferral account balances that is related to items that will be reclassified to profit or loss. [Refer: Regulatory deferral account balances [member]; Other comprehensive income] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Introjtu komprensiv ieħor, nett mit-taxxa, ċaqliq nett fil-bilanċi tal-kont ta’ differiment regolatorju relatat mal-entrati li se jiġu riklassifikati bħala profitt jew telf | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| L-ammont ta’ introjtu komprensiv ieħor, nett mit-taxxa, relatat maċ-ċaqliq nett fil-bilanċi tal-kont ta’ differiment regolatorju li huwa relatat mal-entrati li se jiġu riklassifikati bħala profitt jew telf. [Refer: Bilanċi tal-kont ta’ differiment regolatorju [member]; Introjtu komprensiv ieħor] | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Introjtu komprensiv ieħor, nett mit-taxxa, ċaqliq nett fil-bilanċi tal-kont ta’ differiment regolatorju relatat mal-entrati li se jiġu riklassifikati bħala profitt jew telf | mt | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |