| Standard label: | Liability for Asbestos and Environmental Claims, Gross |
| Name: | us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsGross |
| Documentation: | Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers. |
| 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:LiabilityForAsbestosAndEnvironmentalClaimsGross |
| Label | Role | Language |
| Liability for Asbestos and Environmental Claims, Gross | http://www.xbrl.org/2003/role/label | en-US |
| Liability for Asbestos and Environmental Claims, Gross, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Liability for Asbestos and Environmental Claims, Gross, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 3 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| FASB Accounting Standards Codification 944 40 50 3 (cc) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |