GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER INCOME, NET (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Income [Line Items]
Allowance for equity funds used during construction	$ 37	$ 34	$ 70	$ 69
Investment gains (losses), net	5	(34)	17	(47)
(Losses) gains on interest rate and foreign exchange instruments, net	(1)	(1)	4	5
Foreign currency transaction gains (losses), net	3	(3)	4	(22)
Non-service components of net periodic benefit cost	(26)	(9)	(51)	32
Interest on regulatory balancing accounts, net	19	4	37	5
Sundry, net	(6)	8	(9)	(5)
Total	31	(1)	72	37
San Diego Gas and Electric Company
Other Income [Line Items]
Allowance for equity funds used during construction	23	21	46	42
Non-service components of net periodic benefit cost	(5)	(2)	(9)	9
Interest on regulatory balancing accounts, net	11	3	21	4
Sundry, net	(7)	0	(8)	1
Total	22	22	50	56
Southern California Gas Company
Other Income [Line Items]
Allowance for equity funds used during construction	14	13	24	26
Non-service components of net periodic benefit cost	(19)	(6)	(38)	26
Interest on regulatory balancing accounts, net	8	1	16	1
Sundry, net	(2)	(4)	(9)	(15)
Total	$ 1	$ 4	$ (7)	38
IMG
Other Income [Line Items]
Foreign currency transaction gains (losses), net				$ (11)