| Standard label: | Policyholder Account Balance, Interest Expense |
| Name: | us-gaap:InterestCreditedToPolicyholdersAccountBalances |
| Documentation: | Amount of interest expense for allocation to policyholder account balance. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InterestCreditedToPolicyholdersAccountBalances |
| Label | Role | Language |
| Policyholder Account Balance, Interest Expense | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 20 45 2 (c) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(6)) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 40 50 7A (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 40 55 29F | http://www.xbrl.org/2003/role/exampleRef | 944 |
| FASB Accounting Standards Codification 944 40 55 13J (g) | http://www.xbrl.org/2003/role/exampleRef | 944 |
| Part Of Roll Up: |
| us-gaap:CostOfRevenue |