cm:Level1TextBlock: us-gaap:ShortDurationInsuranceAndDepositContractsTextBlock
| Short-Duration Insurance and Deposit Contracts [Text Block] |
| us-gaap:ShortDurationInsuranceAndDepositContractsTextBlock |
| The entire disclosure for insurance products considered to be short-duration contracts because the contract provides insurance protection for a fixed period of short duration and enables the insurer to cancel the contract or to adjust the provisions of the contract at the end of any contract period, such as adjusting the amount of premiums charged or coverage provided, and on contracts on which amounts are paid but insurance risk is not transferred. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ShortDurationInsuranceAndDepositContractsTextBlock |