Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies (SCE Collective Bargaining Agreement) (Details) - Southern California Edison - Employees covered by collective bargaining agreements - employee	Oct. 02, 2017	Sep. 30, 2017
Concentration Risk [Line Items]
Full time employees		3,900
Subsequent event
Concentration Risk [Line Items]
Wage increase	3.00%