| Standard label: | Net Amount at Risk by Product and Guarantee, Separate Account Value |
| Name: | us-gaap:NetAmountAtRiskByProductAndGuaranteeSeparateAccountValue |
| Documentation: | Value of the separate accounts corresponding to the specified product, guarantee type and subset of the guarantee. |
| 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:NetAmountAtRiskByProductAndGuaranteeSeparateAccountValue |
| Label | Role | Language |
| Net Amount at Risk by Product and Guarantee, Separate Account Value | 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 80 50 1 ((d)(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |