REGULATORY MATTERS - SCHEDULE OF GENERAL RATE CASE AUTHORIZED REVENUE INCREASES (Details) $ in Millions	Sep. 26, 2019 USD ($)
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%