REGULATORY MATTERS - SCHEDULE OF GENERAL RATE CASE AUTHORIZED REVENUE INCREASES (Details) - USD ($) $ in Millions		1 Months Ended
	Sep. 26, 2019	May 31, 2021	Apr. 30, 2020
San Diego Gas and Electric Company [Member] | General Rate Case
General Rate Case [Line Items]
Tracked income tax expense liability			$ 86
SoCalGas | General Rate Case
General Rate Case [Line Items]
Tracked income tax expense liability			$ 89
2019 GRC FD | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
GRC revenue requirement	$ 1,990
2019 GRC FD | San Diego Gas and Electric Company [Member] | Electricity
General Rate Case [Line Items]
GRC revenue requirement	1,590
2019 GRC FD | San Diego Gas and Electric Company [Member] | Gas
General Rate Case [Line Items]
GRC revenue requirement	400
2019 GRC FD | SoCalGas
General Rate Case [Line Items]
GRC revenue requirement	2,770
2020 GRC FD | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 134
Percent increase (as a percent)	6.74%
2020 GRC FD | San Diego Gas and Electric Company [Member] | O&M
General Rate Case [Line Items]
Revenue increase	$ 20
Percent increase (as a percent)	2.64%
2020 GRC FD | San Diego Gas and Electric Company [Member] | Capital-related costs
General Rate Case [Line Items]
Revenue increase	$ 114
Percent increase (as a percent)	9.74%
2020 GRC FD | SoCalGas
General Rate Case [Line Items]
Revenue increase	$ 220
Percent increase (as a percent)	7.92%
2020 GRC FD | SoCalGas | O&M
General Rate Case [Line Items]
Revenue increase	$ 36
Percent increase (as a percent)	2.64%
2020 GRC FD | SoCalGas | Capital-related costs
General Rate Case [Line Items]
Revenue increase	$ 184
Percent increase (as a percent)	14.36%
2021 GRC FD | San Diego Gas and Electric Company [Member]
General Rate Case [Line Items]
Revenue increase	$ 102
Percent increase (as a percent)	4.83%
2021 GRC FD | San Diego Gas and Electric Company [Member] | O&M
General Rate Case [Line Items]
Revenue increase	$ 19
Percent increase (as a percent)	2.47%
2021 GRC FD | San Diego Gas and Electric Company [Member] | Capital-related costs
General Rate Case [Line Items]
Revenue increase	$ 83
Percent increase (as a percent)	6.47%
2021 GRC FD | SoCalGas
General Rate Case [Line Items]
Revenue increase	$ 150
Percent increase (as a percent)	5.00%
2021 GRC FD | SoCalGas | O&M
General Rate Case [Line Items]
Revenue increase	$ 34
Percent increase (as a percent)	2.40%
2021 GRC FD | SoCalGas | Capital-related costs
General Rate Case [Line Items]
Revenue increase	$ 116
Percent increase (as a percent)	7.93%
2019 GRC FD - 2022 Requirement | San Diego Gas and Electric Company [Member] | General Rate Case
General Rate Case [Line Items]
Revenue increase		$ 87
Percent increase (as a percent)		3.92%
2019 GRC FD - 2022 Requirement | SoCalGas | General Rate Case
General Rate Case [Line Items]
Revenue increase		$ 142
Percent increase (as a percent)		4.53%
2019 GRC FD - 2023 Requirement | San Diego Gas and Electric Company [Member] | General Rate Case
General Rate Case [Line Items]
Revenue increase		$ 86
Percent increase (as a percent)		3.70%
2019 GRC FD - 2023 Requirement | SoCalGas | General Rate Case
General Rate Case [Line Items]
Revenue increase		$ 130
Percent increase (as a percent)		3.97%