Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28446-109314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28511-109314

Name:	us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income Taxes (Textual) (Details) - IRS Examination - Disallowance of Repair Allowance Deduction - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2015
Tax Years 2010 to 2012
Income Tax Disclosure [Line Items]
Tax liability		$ 94
Southern California Edison \| Tax Years 2007 to 2009
Income Tax Disclosure [Line Items]
Tax liability	$ 64
Southern California Edison \| Tax Years 2010 to 2012
Income Tax Disclosure [Line Items]
Tax liability		$ 100
Southern California Edison \| Tax Years 2010 to 2012, Federal [Member]
Income Tax Disclosure [Line Items]
Tax liability	$ (9)