cm:Concept: us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
| Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased |
| us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased |
| Share of plant output being purchased under a long-term contract to purchase electricity from a production plant constructed and financed by a public utility district, cooperative, or other organization. |
| cm:Concept |
| Percent (num:percentItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased |