cm:Level2TextBlock: us-gaap:PolicyholderAccountsPolicy
| Policyholder Accounts, Policy [Policy Text Block] |
| us-gaap:PolicyholderAccountsPolicy |
| Disclosure of accounting policy for contracts reported in separate accounts, including the extent and terms of minimum guarantees, basis of presentation for separate account assets and liabilities and related separate account activity, the liability valuation method and assumptions used in valuing each type of policyholder and contract holder account maintained by the entity. |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:PolicyholderAccountsPolicy |