cm:Member: us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember
| Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] |
| us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember |
| Accumulated other comprehensive income (loss) resulting from foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to the noncontrolling interest. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember |