Commitments and Contingencies (Waiver of CPUC Equity Ratio Requirement) (Details) - SCE	12 Months Ended
Dec. 31, 2018
Other Commitments [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	48.00%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)	37 months
Waiver threshold percent	47.00%

This element represents the authorized percentage of weighted-average common equity component of total capitalization required to distribute the dividend.

No definition available.

Name:	eix_WeightedAverageCommonEquityComponentMinimumPercentageAuthorizationSetByCPUC
Namespace Prefix:	eix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration