CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) - Year 2016 [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2019	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				$ 1,811
General Rate Case, Revenue Requirement Increase, Original Request	133
General Rate Case, Revenue Requirement Increase, Revised Request	$ 111				(100)
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)					$ 17
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		4.30%	3.50%	3.50%	1.00%
General Rate Case, Adjustment To Decrease Estimated Revenue Requirement	16
General Rate Case, Proposed Rate Base Adjustment					$ 93
General Rate Case, Tax Memorandum Accounts Balance	34
Southern California Gas Company [Member]
General Rate Case [Line Items]
General Rate Case, Revenue Requirement, Revised Request	2,342				2,219
General Rate Case, Revenue Requirement Increase, Original Request	256
General Rate Case, Revenue Requirement Increase, Revised Request	$ 246				(133)
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)					$ 122
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)		4.30%	3.50%	3.50%	6.00%
General Rate Case, Proposed Rate Base Adjustment					$ 92
General Rate Case, Tax Memorandum Accounts Balance	$ 46