GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]	$ 27,115
OCI before reclassifications		(43)	$ 83
Amounts reclassified from AOCI		(4)	6
Net OCI		(47)	89
Ending balance		27,667
Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(135)	(318)
Ending balance		(182)	(229)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(59)	(79)
OCI before reclassifications		10	3
Amounts reclassified from AOCI		0	0
Net OCI		10	3
Ending balance		(49)	(76)
Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		10	(156)
OCI before reclassifications		(40)	74
Amounts reclassified from AOCI		(5)	4
Net OCI		(45)	78
Ending balance		(35)	(78)
Pension and PBOP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(86)	(83)
OCI before reclassifications		(13)	6
Amounts reclassified from AOCI		1	2
Net OCI		(12)	8
Ending balance		(98)	(75)
San Diego Gas and Electric Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]	9,067
Ending balance		9,325
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)
Ending balance		(7)	(10)
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)
Ending balance		(7)	(10)
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	1
Net OCI		1	1
Ending balance		7,059
Southern California Gas Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(24)	(31)
Ending balance		(23)	(30)
Southern California Gas Company | Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(12)	(13)
Amounts reclassified from AOCI		0	0
Net OCI		0	0
Ending balance		(12)	(13)
Southern California Gas Company | Pension and PBOP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(12)	(18)
Amounts reclassified from AOCI		1	1
Net OCI		1	1
Ending balance		$ (11)	$ (17)

[1] Derived from audited financial statements.