CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) - Year 2016 [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
General Rate Case, Revenue Requirement, Revised Request	$ 1,905
General Rate Case, Revenue Requirement Increase, Original Request	133
General Rate Case, Revenue Requirement Increase, Revised Request	$ 111			$ 111
General Rate Case, Revenue Requirement Percentage Increase, Revised Request	6.00%
General Rate Case, Revised Request Decrease Compared To Original	$ 6
General Rate Case, Proposed Revenue Requirement Increase (Decrease)		$ 62	$ 60	$ (84)
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		3.50%	3.50%	(4.70%)
General Rate Case, Adjustment To Decrease Estimated Revenue Requirement	16
Southern California Gas Company [Member]
General Rate Case [Line Items]
General Rate Case, Revenue Requirement, Revised Request	2,342
General Rate Case, Revenue Requirement Increase, Original Request	256
General Rate Case, Revenue Requirement Increase, Revised Request	$ 246			$ 246
General Rate Case, Revenue Requirement Percentage Increase, Revised Request	12.00%
General Rate Case, Revised Request Decrease Compared To Original	$ 10
General Rate Case, Proposed Revenue Requirement Increase (Decrease)		$ 78	$ 75	$ 49
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		3.50%	3.50%	2.30%