GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]	$ 25,981
OCI before reclassifications		83	$ 75
Amounts reclassified from AOCI		6	26
Net OCI		89	101
Ending balance		26,114
Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(318)	(500)
Ending balance		(229)	(399)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(79)	(64)
OCI before reclassifications		3	(5)
Amounts reclassified from AOCI		0	0
Net OCI		3	(5)
Ending balance		(76)	(69)
Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(156)	(331)
OCI before reclassifications		74	73
Amounts reclassified from AOCI		4	19
Net OCI		78	92
Ending balance		(78)	(239)
Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(83)	(105)
OCI before reclassifications		6	7
Amounts reclassified from AOCI		2	7
Net OCI		8	14
Ending balance		(75)	(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		8,483
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)
Ending balance		(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)
Ending balance		(10)	(10)
Southern California Gas Company
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]	5,442
Amounts reclassified from AOCI		1
Net OCI		1
Ending balance		5,777
Southern California Gas Company | Total accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(31)	(31)
Ending balance		(30)	(31)
Southern California Gas Company | Financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(13)	(13)
Amounts reclassified from AOCI		0
Net OCI		0
Ending balance		(13)	(13)
Southern California Gas Company | Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(18)	(18)
Amounts reclassified from AOCI		1
Net OCI		1
Ending balance		$ (17)	$ (18)

[1] Derived from audited financial statements.