cm:Concept: us-gaap:RecognitionOfDeferredRevenue
| Recognition of Deferred Revenue |
| us-gaap:RecognitionOfDeferredRevenue |
| The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:RecognitionOfDeferredRevenue |