| Standard label: | Gain (Loss) on Securitization of Financial Assets |
| Name: | us-gaap:GainLossOnSecuritizationOfFinancialAssets |
| Documentation: | A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GainLossOnSecuritizationOfFinancialAssets |
| Label | Role | Language |
| Gain (Loss) on Securitization of Financial Assets | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(b)(7)(c)) | http://www.xbrl.org/2009/role/commonPracticeRef | 220 |
| FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(b)(9)(a)) | http://www.xbrl.org/2009/role/commonPracticeRef | 220 |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 860 20 50 3 (b)(3) | http://www.xbrl.org/2003/role/disclosureRef | 860 |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04(13)) | http://www.xbrl.org/2009/role/commonPracticeRef | 942 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(3)(a)) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| Part Of Roll Up: |
| us-gaap:GainsLossesOnSalesOfAssets |
| us-gaap:RealizedInvestmentGainsLosses |