GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]			$ 25,981
Ending balance		$ 26,841		26,841
Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(229)	$ (399)	(318)	$ (500)
OCI before reclassifications		39	(57)	122	18
Amounts reclassified from AOCI		23	12	29	38
Net OCI		62	(45)	151	56
Ending balance		(167)	(444)	(167)	(444)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(76)	(69)	(79)	(64)
OCI before reclassifications		1	(19)	4	(24)
Amounts reclassified from AOCI		10	0	10	0
Net OCI		11	(19)	14	(24)
Ending balance		(65)	(88)	(65)	(88)
AOCI associated with noncontrolling interests		9		9
Foreign currency translation adjustments | IEnova
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests			24		24
Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(78)	(239)	(156)	(331)
OCI before reclassifications		37	(36)	111	37
Amounts reclassified from AOCI		11	10	15	29
Net OCI		48	(26)	126	66
Ending balance		(30)	(265)	(30)	(265)
Financial instruments | IEnova
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests			14		14
Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(75)	(91)	(83)	(105)
OCI before reclassifications		1	(2)	7	5
Amounts reclassified from AOCI		2	2	4	9
Net OCI		3	0	11	14
Ending balance		(72)	(91)	(72)	(91)
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		8,659		8,659
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
Ending balance		(10)	10	(10)	10
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
Ending balance		(10)	10	(10)	10
Southern California Gas Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[2]			5,442
Ending balance		6,015		6,015
Southern California Gas Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(30)	(31)	(31)	(31)
Amounts reclassified from AOCI		1	1	2	1
Net OCI		1	1	2	1
Ending balance		(29)	(30)	(29)	(30)
Southern California Gas Company | Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(13)	(13)	(13)	(13)
Amounts reclassified from AOCI		1	0	1	0
Net OCI		1	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)	(18)	(18)	(18)
Amounts reclassified from AOCI		0	1	1	1
Net OCI		0	1	1	1
Ending balance		$ (17)	$ (17)	$ (17)	$ (17)

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.