Commitments and Contingencies (Details)	Jun. 30, 2014
Loss Contingencies [Line Items]
Loss Contingency Pending Gas Market Manipulation Lawsuits Number	1

The total number of pending lawsuits related to gas market manipulation.

No definition available.

Name:	cehe_LossContingencyPendingGasMarketManipulationLawsuitsNumber
Namespace Prefix:	cehe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant