| Standard label: | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
| Name: | us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Documentation: | Accumulated other comprehensive income (loss) resulting from gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges, attributable to the parent. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Label | Role | Language |
| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 14A | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 220 10 45 10A (d) | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 220 10 45 17B | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 810 10 50 1A (c)(3) | http://www.xbrl.org/2003/role/disclosureRef | 810 |