cm:Concept: us-gaap:LossContingencyPartiesJointlyAndSeverallyLiableInLitigation
| Loss Contingency, Parties Jointly and Severally Liable in Litigation |
| us-gaap:LossContingencyPartiesJointlyAndSeverallyLiableInLitigation |
| Identifies individuals or entities that are co-defendants in a lawsuit, and who may have to pay all or a portion of any damages awarded. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LossContingencyPartiesJointlyAndSeverallyLiableInLitigation |