cm:Concept: us-gaap:EnvironmentalApplicabilityImpactAndConclusionDisclosures
| Environmental Applicability, Impact and Conclusion Disclosures |
| us-gaap:EnvironmentalApplicabilityImpactAndConclusionDisclosures |
| The general applicability and impact of environmental laws and regulations upon the entity's business and how the existence of such laws and regulations may continue to give rise to loss contingencies for future environmental remediation. The disclosure may include a contingency conclusion that addresses the estimated total unrecognized exposure to environmental remediation and other loss contingencies. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EnvironmentalApplicabilityImpactAndConclusionDisclosures |