Summary of Significant Accounting Policies (Details) (Southern California Edison, Electric Utility)	6 Months Ended
Jun. 30, 2013 sqmi
Southern California Edison \| Electric Utility
Summary of Significant Accounting Policies [Line Items]
Supply of electricity, area covered (square mile)	50,000

This element represents the total area covered in supply of electricity.

No definition available.

Name:	eix_SupplyOfElectricityAreaCovered
Namespace Prefix:	eix_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration