cm:Concept: us-gaap:AssetRetirementObligationsSignificantChanges
Asset Retirement Obligations, Significant Changes |
us-gaap:AssetRetirementObligationsSignificantChanges |
Description of the significant increases or decreases in the carrying amount of the asset retirement obligation during the period, such as changes in significant assumptions used to calculate the carrying amount of the asset retirement obligation. |
cm:Concept |
Text/String (xbrli:stringItemType) |
For Period (duration) |
(no balance type) |
false |
us-gaap:AssetRetirementObligationsSignificantChanges |