| Standard label: | Auction Market Preferred Securities, Stock Series, Per-Share Redemption Amount |
| Name: | us-gaap:AuctionMarketPreferredSecuritiesStockSeriesPerShareRedemptionAmount |
| Documentation: | The per-share amount at which preferred stock may be called or is subject to redemption through sinking-fund operations or otherwise. |
| Object type: | cm:Concept |
| Data type: | Share (num:perShareItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AuctionMarketPreferredSecuritiesStockSeriesPerShareRedemptionAmount |
| Label | Role | Language |
| Auction Market Preferred Securities, Stock Series, Per-Share Redemption Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 505 10 50 5 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |