SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER INCOME (EXPENSE), NET (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Income [Line Items]
Allowance for equity funds used during construction	$ 143	$ 133	$ 128
Investment (losses) gains, net	(42)	50	41
Gains (losses) on interest rate and foreign exchange instruments, net	11	(28)	(67)
Foreign currency transaction losses, net	(24)	(18)	(25)
Non-service component of net periodic benefit cost	(59)	(67)	(102)
Interest on regulatory balancing accounts, net	26	6	14
Sundry, net	(31)	(18)	(37)
Total	24	58	(48)
San Diego Gas and Electric Company
Other Income [Line Items]
Allowance for equity funds used during construction	88	81	79
Non-service component of net periodic benefit cost	(11)	(13)	(20)
Interest on regulatory balancing accounts, net	18	6	9
Sundry, net	(3)	(10)	(16)
Total	92	64	52
SoCalGas
Other Income [Line Items]
Allowance for equity funds used during construction	55	48	41
Non-service component of net periodic benefit cost	(42)	(40)	(54)
Interest on regulatory balancing accounts, net	8	0	5
Sundry, net	(29)	(22)	(20)
Total	(8)	(14)	(28)
IMG JV
Other Income [Line Items]
Foreign currency transaction losses, net	$ (11)	$ (23)	$ (42)