CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) (Year 2016 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 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)		63	61	(62)
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		3.50%	3.50%	(3.50%)
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	$ 76	$ 70
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		3.50%	3.50%	3.30%