Commitments and Contingencies (Wildfire Insurance) (Details) - Southern California Edison	Sep. 30, 2017 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Threshold for wildfire claims (new lines for additional coverage)	$ 1,000,000,000
Self-insured retention per wildfire occurrence	$ 10,000,000

This element represents the increase in self insurance retention per wildfire occurrence.

No definition available.

Name:	eix_IncreaseInSelfInsuranceRetentionPerWildfireOccurrence
Namespace Prefix:	eix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant