cm:Level2TextBlock: us-gaap:FullCostOrSuccessfulEffortsPolicy
| Full Cost or Successful Efforts, Policy [Policy Text Block] |
| us-gaap:FullCostOrSuccessfulEffortsPolicy |
| Disclosure of accounting policy for accounting for costs incurred in oil and gas activities. This policy addresses whether an entity uses the successful efforts method or full cost method. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:FullCostOrSuccessfulEffortsPolicy |