SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 3,289	$ 3,083	$ 2,972
Accretion expense	133	127	123
Liabilities incurred and acquired	20	2	2
Deconsolidation	0	0	(2)
Payments	(63)	(63)	(46)
Revisions	159	140	34
Ending Balance	3,538	3,289	3,083
San Diego Gas and Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	876	866	874
Accretion expense	38	39	39
Liabilities incurred and acquired	2	0	0
Deconsolidation	0	0	(2)
Payments	(60)	(60)	(44)
Revisions	34	31	(1)
Ending Balance	890	876	866
Revisions for early decommissioning of SONGS	22
SoCalGas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	2,368	2,177	2,063
Accretion expense	92	86	81
Liabilities incurred and acquired	0	0	0
Deconsolidation	0	0	0
Payments	(3)	(2)	(2)
Revisions	125	107	35
Ending Balance	$ 2,582	$ 2,368	$ 2,177