| 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 |
| Skattesaldi for regulatoriske aktiver og forpligtelser [member] | da | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Dette element står for en kategori af saldi for regulatoriske aktiver og forpligtelser, som vedrører beskatning. [Reference: Kategorier af saldi for regulatoriske aktiver og forpligtelser [member]] | da | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |