GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER (EXPENSE) INCOME, NET (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income [Line Items]
Allowance for equity funds used during construction	$ 34	$ 34	$ 69	$ 72
Investment (losses) gains, net	(34)	19	(47)	28
(Losses) gains on interest rate and foreign exchange instruments, net	(1)	7	5	(23)
Foreign currency transaction (losses) gains, net	(3)	26	(22)	7
Non-service components of net periodic benefit (cost) credit	(9)	(15)	32	14
Interest on regulatory balancing accounts, net	4	2	5	3
Sundry, net	8	(1)	(5)	6
Total	(1)	72	37	107
San Diego Gas and Electric Company
Other Income [Line Items]
Allowance for equity funds used during construction	21	22	42	45
Non-service components of net periodic benefit (cost) credit	(2)	(4)	9	5
Interest on regulatory balancing accounts, net	3	2	4	3
Sundry, net	0	2	1	4
Total	22	22	56	57
Southern California Gas Company
Other Income [Line Items]
Allowance for equity funds used during construction	13	11	26	23
Non-service components of net periodic benefit (cost) credit	(6)	(9)	26	19
Interest on regulatory balancing accounts, net	1	0	1	0
Sundry, net	(4)	(4)	(15)	(5)
Total	$ 4	(2)	38	37
IMG
Other Income [Line Items]
Foreign currency transaction (losses) gains, net		$ 28	$ (11)	$ 5