SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER INCOME (EXPENSE), NET (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income [Line Items]
Allowance for equity funds used during construction	$ 140	$ 143	$ 133
Investment gains (losses), net	28	(42)	50
Gains (losses) on interest rate and foreign exchange instruments, net	4	11	(28)
Foreign currency transaction gains (losses), net	2	(24)	(18)
Non-service components of net periodic benefit cost	(106)	(59)	(67)
Interest on regulatory balancing accounts, net	79	26	6
Sundry, net	(16)	(31)	(18)
Total	131	24	58
SDG&E
Other Income [Line Items]
Allowance for equity funds used during construction	86	88	81
Non-service components of net periodic benefit cost	(19)	(11)	(13)
Interest on regulatory balancing accounts, net	42	18	6
Sundry, net	(12)	(3)	(10)
Total	97	92	64
SoCalGas
Other Income [Line Items]
Allowance for equity funds used during construction	54	55	48
Non-service components of net periodic benefit cost	(80)	(42)	(40)
Interest on regulatory balancing accounts, net	37	8	0
Sundry, net	(15)	(29)	(22)
Total	$ (4)	(8)	(14)
IMG JV
Other Income [Line Items]
Foreign currency transaction gains (losses), net		$ (11)	$ (23)