cm:Level1TextBlock: us-gaap:InsuranceContractAcquisitionCostTextBlock
| Insurance Contract, Acquisition Cost [Text Block] |
| us-gaap:InsuranceContractAcquisitionCostTextBlock |
| The entire disclosure for cost related directly to successful acquisition of new and renewal of insurance contract. Includes, but is not limited to, deferred policy acquisition cost, deferred sale inducement cost, and present value of future profit of insurance contract acquired in business combination. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:InsuranceContractAcquisitionCostTextBlock |