cm:Member: us-gaap:AociIncludingPortionAttributableToNoncontrollingInterestMember
| AOCI Including Portion Attributable to Noncontrolling Interest [Member] |
| us-gaap:AociIncludingPortionAttributableToNoncontrollingInterestMember |
| Accumulated change in equity from transactions and other events and circumstances from non-owner sources, including the portion attributable to the noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:AociIncludingPortionAttributableToNoncontrollingInterestMember |