cm:Level3TextBlock: us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodTableTextBlock
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Table Text Block] |
us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodTableTextBlock |
Tabular disclosure of financial guarantee insurance contracts in which premiums are received over the contract period. |
cm:Level3TextBlock |
Text Block (HTML) (nonnum:textBlockItemType) |
For Period (duration) |
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false |
us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodTableTextBlock |