| Contingent liability for decommissioning, restoration and rehabilitation costs [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for a contingent liability relating to decommissioning, restoration and rehabilitation costs. [Refer: Contingent liabilities [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Eventualforpligtelser for omkostninger forbundet med afvikling, retablering og genopretning [member] | da | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Dette element står for en eventualforpligtelse vedrørende omkostninger forbundet med afvikling, retablering og genopretning. [Reference: eventualforpligtelser [member]] | da | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |