REGULATORY MATTERS - GENERAL RATE CASE (Details) - General Rate Case [Member] - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2021	Apr. 30, 2020
San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Tracked income tax expense liability		$ 86
Southern California Gas Company [Member]
General Rate Case [Line Items]
Tracked income tax expense liability		$ 89
2019 GRC FD - 2022 Requirement [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 87
Percent increase	3.92%
GRC requested revenue requirement	$ 91
General Rate Case, Reduction of Revenue Requirement	30
2019 GRC FD - 2022 Requirement [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 142
Percent increase	4.53%
GRC requested revenue requirement	$ 150
2019 GRC FD - 2023 Requirement [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 86
Percent increase	3.70%
GRC requested revenue requirement	$ 104
2019 GRC FD - 2023 Requirement [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 130
Percent increase	3.97%
GRC requested revenue requirement	$ 131