NUCLEAR PLANT - DECOMMISSIONING AND FUNDING (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	[1]
Nuclear Plant Decommissioning And Funding [Line Items]
Nuclear decommissioning trusts	$ 1,103	$ 1,063
San Diego Gas and Electric Company [Member]
Nuclear Plant Decommissioning And Funding [Line Items]
Nuclear decommissioning trusts	1,103	$ 1,063
Year 2013-2016 [Member]
Nuclear Plant Decommissioning And Funding [Line Items]
Authorized Recovery Amount, Nuclear Decommissioning Trust Funding	218
Amount Pending IRS Clarification	75
Year 2013-2016 [Member] | San Diego Gas and Electric Company [Member]
Nuclear Plant Decommissioning And Funding [Line Items]
Authorized Recovery Amount, Nuclear Decommissioning Trust Funding	218
Amount Pending IRS Clarification	$ 75

[1] Derived from audited financial statements.