GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			$ 25,981
Ending balance		$ 27,030		27,030
Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(167)	$ (444)	(318)	$ (500)
OCI before reclassifications		40	7	162	25
Amounts reclassified from AOCI		7	19	36	57
Net OCI		47	26	198	82
Ending balance		(120)	(418)	(120)	(418)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(65)	(88)	(79)	(64)
OCI before reclassifications		0	0	4	(24)
Amounts reclassified from AOCI		0	0	10	0
Net OCI		0	0	14	(24)
Ending balance		(65)	(88)	(65)	(88)
AOCI associated with noncontrolling interests				9
Foreign currency translation adjustments | IEnova
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests			4		(20)
Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(30)	(265)	(156)	(331)
OCI before reclassifications		40	15	151	52
Amounts reclassified from AOCI		5	16	20	45
Net OCI		45	31	171	97
Ending balance		15	(234)	15	(234)
Financial instruments | IEnova
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests			2		(12)
Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(72)	(91)	(83)	(105)
OCI before reclassifications		0	(8)	7	(3)
Amounts reclassified from AOCI		2	3	6	12
Net OCI		2	(5)	13	9
Ending balance		(70)	(96)	(70)	(96)
San Diego Gas and Electric Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			8,249
Ending balance		8,831		8,831
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		(10)	(10)	(10)	(10)
Amounts reclassified from AOCI		1	1	1	1
Net OCI		1	1	1	1
Ending balance		(9)	(9)	(9)	(9)
San Diego Gas and Electric Company | Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(10)	(10)	(10)	(10)
Amounts reclassified from AOCI		1	1	1	1
Net OCI		1	1	1	1
Ending balance		(9)	(9)	(9)	(9)
Southern California Gas Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[2]			5,442
Ending balance		6,434		6,434
Southern California Gas Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(29)	(30)	(31)	(31)
Amounts reclassified from AOCI		1	1	3	2
Net OCI		1	1	3	2
Ending balance		(28)	(29)	(28)	(29)
Southern California Gas Company | Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(12)	(13)	(13)	(13)
Amounts reclassified from AOCI		0	0	1	0
Net OCI		0	0	1	0
Ending balance		(12)	(13)	(12)	(13)
Southern California Gas Company | Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(17)	(17)	(18)	(18)
Amounts reclassified from AOCI		1	1	2	2
Net OCI		1	1	2	2
Ending balance		$ (16)	$ (16)	$ (16)	$ (16)

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.