| Standard label: | Liabilities Related to Investment Contracts, Fair Value Disclosure |
| Name: | us-gaap:LiabilitiesRelatedToInvestmentContractsFairValueDisclosure |
| Documentation: | Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LiabilitiesRelatedToInvestmentContractsFairValueDisclosure |
| Label | Role | Language |
| Liabilities Related to Investment Contracts, Fair Value Disclosure | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 825 25 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| Part Of Roll Up: |
| us-gaap:FinancialLiabilitiesFairValueDisclosure |