CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF GENERAL RATE CASE (Details) - Year 2016 [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
San Diego Gas and Electric Company [Member]
Public Utilities General Disclosures [Line Items]
General Rate Case, Revenue Requirement, Revised Request				$ 1,811
General Rate Case, Revenue Requirement Increase, Original Request				133
General Rate Case, Revenue Requirement Increase, Revised Request				$ 17
General Rate Case, Revenue Requirement Percentage Increase, Revised Request	4.30%	3.50%	3.50%	1.00%
General Rate Case, Revised Request Decrease Compared To Original				$ (100)
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					$ 39
Southern California Gas Company [Member]
Public Utilities General Disclosures [Line Items]
General Rate Case, Revenue Requirement, Revised Request				2,219
General Rate Case, Revenue Requirement Increase, Original Request				256
General Rate Case, Revenue Requirement Increase, Revised Request				$ 122
General Rate Case, Revenue Requirement Percentage Increase, Revised Request	4.30%	3.50%	3.50%	6.00%
General Rate Case, Revised Request Decrease Compared To Original				$ (133)
General Rate Case, Proposed Rate Base Adjustment				$ 92
General Rate Case, Tax Memorandum Accounts Balance					$ 74