GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER (EXPENSE) INCOME, NET (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other Income [Line Items]
Allowance for equity funds used during construction	$ 35	$ 31	$ 104	$ 103
Investment (losses) gains, net	(13)	0	(60)	28
(Losses) gains on interest rate and foreign exchange instruments, net	(3)	(3)	2	(26)
Foreign currency transaction (losses) gains, net	4	(17)	(18)	(10)
Non-service components of net periodic benefit cost	(77)	(66)	(45)	(52)
Interest on regulatory balancing accounts, net	7	2	12	5
Sundry, net	7	(2)	2	4
Total	(40)	(55)	(3)	52
San Diego Gas and Electric Company
Other Income [Line Items]
Allowance for equity funds used during construction	22	18	64	63
Non-service components of net periodic benefit cost	(17)	(15)	(8)	(10)
Interest on regulatory balancing accounts, net	5	2	9	5
Sundry, net	2	(1)	3	3
Total	12	4	68	61
Southern California Gas Company
Other Income [Line Items]
Allowance for equity funds used during construction	14	13	40	36
Non-service components of net periodic benefit cost	(58)	(49)	(32)	(30)
Interest on regulatory balancing accounts, net	2	0	3	0
Sundry, net	(1)	(3)	(16)	(8)
Total	$ (43)	(39)	(5)	(2)
IMG
Other Income [Line Items]
Foreign currency transaction (losses) gains, net		$ (18)	$ (11)	$ (13)