GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			$ 27,115
OCI before reclassifications		$ 111	$ 40	132	$ 162
Amounts reclassified from AOCI		(50)	7	(57)	36
Net OCI		61	47	75	198
Ending balance		28,238		28,238
Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(121)	(167)	(135)	(318)
Ending balance		(60)	(120)	(60)	(120)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(38)	(65)	(59)	(79)
OCI before reclassifications		(5)	0	16	4
Amounts reclassified from AOCI		0	0	0	10
Net OCI		(5)	0	16	14
Ending balance		(43)	(65)	(43)	(65)
AOCI associated with noncontrolling interests					9
Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		14	(30)	10	(156)
OCI before reclassifications		116	40	129	151
Amounts reclassified from AOCI		(51)	5	(60)	20
Net OCI		65	45	69	171
Ending balance		79	15	79	15
AOCI associated with noncontrolling interests		(46)		(46)
Pension and PBOP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(97)	(72)	(86)	(83)
OCI before reclassifications		0	0	(13)	7
Amounts reclassified from AOCI		1	2	3	6
Net OCI		1	2	(10)	13
Ending balance		(96)	(70)	(96)	(70)
San Diego Gas and Electric Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			9,067
Amounts reclassified from AOCI			1		1
Net OCI			1		1
Ending balance		9,683		9,683
San Diego Gas and Electric Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(7)	(10)	(7)	(10)
Ending balance		(7)	(9)	(7)	(9)
San Diego Gas and Electric Company | Pension and PBOP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(7)	(10)	(7)	(10)
Amounts reclassified from AOCI			1		1
Net OCI			1		1
Ending balance		(7)	(9)	(7)	(9)
Southern California Gas Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			6,698
Amounts reclassified from AOCI			1	2	3
Net OCI			1	2	3
Ending balance		7,231		7,231
Southern California Gas Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(22)	(29)	(24)	(31)
Ending balance		(22)	(28)	(22)	(28)
Southern California Gas Company | Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(11)	(12)	(12)	(13)
Amounts reclassified from AOCI			0	1	1
Net OCI			0	1	1
Ending balance		(11)	(12)	(11)	(12)
Southern California Gas Company | Pension and PBOP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(11)	(17)	(12)	(18)
Amounts reclassified from AOCI			1	1	2
Net OCI			1	1	2
Ending balance		$ (11)	$ (16)	$ (11)	$ (16)

[1] Derived from audited financial statements.