| Taxation-related regulatory deferral account balances [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for a class of regulatory deferral account balances that relates to taxation. [Refer: Classes of regulatory deferral account balances [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Bilanċi tal-kont ta’ differiment regolatorju relatati mat-tassazzjoni [member] | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Dan il-membru jirrappreżenta klassi ta’ bilanċi tal-kont ta’ differiment regolatorju li hija relatata mat-tassazzjoni. [Refer: Klassijiet ta’ bilanċi tal-kont ta’ differiment regolatorju [member]] | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |