| Standard label: | Return of Net Deposit [Member] |
| Name: | us-gaap:ReturnOfNetDepositMember |
| Documentation: | Guarantee for a return of net deposit on a guaranteed benefit obligation in traditional and nontraditional long-duration contracts with policy and contract holders. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ReturnOfNetDepositMember |
| Label | Role | Language |
| Return of Net Deposit [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 20 55 15 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| FASB Accounting Standards Codification 944 40 50 7B | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 80 50 1 (d)(2)(a) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |