SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 3,712	$ 3,538	$ 3,289
Accretion expense	148	141	133
Liabilities incurred and acquired	18	21	20
Payments	(62)	(57)	(63)
Revisions	15	69	159
Ending Balance	3,831	3,712	3,538
SDG&E
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	887	890	876
Accretion expense	37	37	38
Liabilities incurred and acquired	15	6	2
Payments	(59)	(54)	(60)
Revisions	14	8	34
Ending Balance	894	887	890
Revisions for early decommissioning of SONGS		1	22
SoCalGas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	2,743	2,582	2,368
Accretion expense	106	101	92
Liabilities incurred and acquired	0	0	0
Payments	(3)	(3)	(3)
Revisions	1	63	125
Ending Balance	$ 2,847	$ 2,743	$ 2,582