| Standard label: | Liability for Future Policy Benefit [Policy Text Block] |
| Name: | us-gaap:FuturePolicyBenefitsLiabilityPolicy |
| Documentation: | Disclosure of accounting policy for liability for future benefit to be paid to or on behalf of policyholder. Includes, but is not limited to, input, judgment, assumption, and method used in measuring liability and change in input, judgment, and assumption. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FuturePolicyBenefitsLiabilityPolicy |
| Label | Role | Language |
| Liability for Future Policy Benefit [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03(13)(b)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 40 50 6 (b)(6) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 40 50 7 | http://www.xbrl.org/2003/role/disclosureRef | 944 |