GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER INCOME, NET (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Income [Line Items]
Allowance for equity funds used during construction	$ 35	$ 35	$ 105	$ 104
Investment gains (losses), net	(19)	(13)	(2)	(60)
Gains (losses) on interest rate and foreign exchange instruments, net	1	(3)	5	2
Foreign currency transaction gains (losses), net	(3)	4	1	(18)
Non-service components of net periodic benefit cost	(28)	(77)	(79)	(45)
Interest on regulatory balancing accounts, net	19	7	56	12
Sundry, net	(2)	7	(11)	2
Total	3	(40)	75	(3)
San Diego Gas and Electric Company
Other Income [Line Items]
Allowance for equity funds used during construction	21	22	67	64
Non-service components of net periodic benefit cost	(5)	(17)	(14)	(8)
Interest on regulatory balancing accounts, net	10	5	31	9
Sundry, net	(1)	2	(9)	3
Total	25	12	75	68
Southern California Gas Company
Other Income [Line Items]
Allowance for equity funds used during construction	14	14	38	40
Non-service components of net periodic benefit cost	(22)	(58)	(60)	(32)
Interest on regulatory balancing accounts, net	9	2	25	3
Sundry, net	(3)	(1)	(12)	(16)
Total	$ (2)	$ (43)	$ (9)	(5)
IMG
Other Income [Line Items]
Foreign currency transaction gains (losses), net				$ 11