| Standard label: | Gains (Losses) on Sales of Credit Card Portfolio |
| Name: | us-gaap:GainsLossesOnSalesOfCreditCardPortfolio |
| Documentation: | The gain (loss) resulting from the sale of credit card receivables (portfolios). |
| 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:GainsLossesOnSalesOfCreditCardPortfolio |
| Label | Role | Language |
| Gains (Losses) on Sales of Credit Card Portfolio | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 860 20 25 1 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 860 |
| Part Of Roll Up: |
| us-gaap:GainsLossesOnSalesOfAssets |