REGULATORY MATTERS - SCHEDULE OF GENERAL RATE CASE AUTHORIZED REVENUE INCREASES (Details) - USD ($) $ in Millions		1 Months Ended
	Sep. 26, 2019	Apr. 30, 2020
San Diego Gas and Electric Company [Member] | General Rate Case [Member]
General Rate Case [Line Items]
Tracked income tax expense liability		$ 86
Southern California Gas Company [Member] | General Rate Case [Member]
General Rate Case [Line Items]
Tracked income tax expense liability		89
2019 GRC FD [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
GRC revenue requirement	$ 1,990
2019 GRC FD [Member] | San Diego Gas and Electric Company [Member] | Electricity [Member]
General Rate Case [Line Items]
GRC revenue requirement	1,590
2019 GRC FD [Member] | San Diego Gas and Electric Company [Member] | Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
General Rate Case [Line Items]
GRC revenue requirement	400
2019 GRC FD [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
GRC revenue requirement	2,770
2020 GRC FD [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 134
Percent increase	6.74%
2020 GRC FD [Member] | San Diego Gas and Electric Company [Member] | O&M [Member]
General Rate Case [Line Items]
Revenue increase	$ 20
Percent increase	2.64%
2020 GRC FD [Member] | San Diego Gas and Electric Company [Member] | Capital-related Costs [Member]
General Rate Case [Line Items]
Revenue increase	$ 114
Percent increase	9.74%
2020 GRC FD [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 220
Percent increase	7.92%
2020 GRC FD [Member] | Southern California Gas Company [Member] | O&M [Member]
General Rate Case [Line Items]
Revenue increase	$ 36
Percent increase	2.64%
2020 GRC FD [Member] | Southern California Gas Company [Member] | Capital-related Costs [Member]
General Rate Case [Line Items]
Revenue increase	$ 184
Percent increase	14.36%
2021 GRC FD [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 102
Percent increase	4.83%
2021 GRC FD [Member] | San Diego Gas and Electric Company [Member] | O&M [Member]
General Rate Case [Line Items]
Revenue increase	$ 19
Percent increase	2.47%
2021 GRC FD [Member] | San Diego Gas and Electric Company [Member] | Capital-related Costs [Member]
General Rate Case [Line Items]
Revenue increase	$ 83
Percent increase	6.47%
2021 GRC FD [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 150
Percent increase	5.00%
2021 GRC FD [Member] | Southern California Gas Company [Member] | O&M [Member]
General Rate Case [Line Items]
Revenue increase	$ 34
Percent increase	2.40%
2021 GRC FD [Member] | Southern California Gas Company [Member] | Capital-related Costs [Member]
General Rate Case [Line Items]
Revenue increase	$ 116
Percent increase	7.93%
2019 GRC FD - 2022 Requirement [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
GRC revenue requirement		91
2019 GRC FD - 2022 Requirement [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
GRC revenue requirement		150
2019 GRC FD - 2023 Requirement [Member] | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
GRC revenue requirement		104
2019 GRC FD - 2023 Requirement [Member] | Southern California Gas Company [Member]
General Rate Case [Line Items]
GRC revenue requirement		$ 131