| Standard label: | Guaranteed Benefit Liability, Net |
| Name: | us-gaap:GuaranteedBenefitLiabilityNet |
| Documentation: | Sum of the amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date, net of reinsurance recoverables, for all guaranteed benefit types. |
| 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:GuaranteedBenefitLiabilityNet |
| Label | Role | Language |
| Guaranteed Benefit Liability, Net | http://www.xbrl.org/2003/role/label | en-US |
| Guaranteed Benefit Liability, Net, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Guaranteed Benefit Liability, Net, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | 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 | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |