| Standard label: | Airline Capacity Purchase Arrangements [Member] |
| Name: | us-gaap:AirlineCapacityPurchaseArrangementsMember |
| Documentation: | Airline capacity services (air miles) purchased from third-party transportation companies, including regional affiliates. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AirlineCapacityPurchaseArrangementsMember |
| Label | Role | Language |
| Airline Capacity Purchase Arrangements [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |