cm:Concept: us-gaap:ForeignReinsuranceTransactions
| Foreign Reinsurance Transactions |
| us-gaap:ForeignReinsuranceTransactions |
| Explanation of the reinsurance purpose, transaction type and accounting treatment of reinsurance transactions executed outside the United States. Information provided may include the nature of the contingent liability in connection with insurance ceded and the nature and effect of material nonrecurring reinsurance transactions. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ForeignReinsuranceTransactions |