SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	$ 25,981
AOCI, ending balance	27,115	$ 25,981
San Diego Gas and Electric Company
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	8,249
AOCI, ending balance	9,067	8,249
SoCalGas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	5,442
AOCI, ending balance	6,698	5,442
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(79)	(64)	$ (607)
OCI before reclassifications	10	(34)	(102)
Amounts reclassified from AOCI	10	19	645
Total other comprehensive income (loss)	20	(15)	543
AOCI, ending balance	(59)	(79)	(64)
AOCI associated with noncontrolling interests	9	19
Foreign currency translation adjustments | IEnova
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests		(28)	(4)
Financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(156)	(331)	(215)
OCI before reclassifications	147	62	(163)
Amounts reclassified from AOCI	19	113	47
Total other comprehensive income (loss)	166	175	(116)
AOCI, ending balance	10	(156)	(331)
AOCI associated with noncontrolling interests		47
Financial instruments | IEnova
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI associated with noncontrolling interests		(16)	(3)
Financial instruments | SoCalGas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(13)	(13)	(13)
OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	1	0	0
Total other comprehensive income (loss)	1	0	0
AOCI, ending balance	(12)	(13)	(13)
Pension and PBOP
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(83)	(105)	(117)
OCI before reclassifications	(11)	8	(26)
Amounts reclassified from AOCI	8	14	38
Total other comprehensive income (loss)	(3)	22	12
AOCI, ending balance	(86)	(83)	(105)
Pension and PBOP | San Diego Gas and Electric Company
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from AOCI			3
Pension and PBOP | San Diego Gas and Electric Company
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(10)	(10)	(16)
OCI before reclassifications	2	(1)	(4)
Amounts reclassified from AOCI	1	1	10
Total other comprehensive income (loss)	3	0	6
AOCI, ending balance	(7)	(10)	(10)
Pension and PBOP | San Diego Gas and Electric Company | SoCalGas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from AOCI			6
Pension and PBOP | SoCalGas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(18)	(18)	(10)
OCI before reclassifications	4	(2)	(10)
Amounts reclassified from AOCI	2	2	2
Total other comprehensive income (loss)	6	0	(8)
AOCI, ending balance	(12)	(18)	(18)
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(318)	(500)	(939)
OCI before reclassifications	146	36	(291)
Amounts reclassified from AOCI	37	146	730
Total other comprehensive income (loss)	183	182	439
AOCI, ending balance	(135)	(318)	(500)
Accumulated other comprehensive income (loss) | San Diego Gas and Electric Company
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(10)	(10)	(16)
OCI before reclassifications	2	(1)	(4)
Amounts reclassified from AOCI	1	1	10
Total other comprehensive income (loss)	3	0	6
AOCI, ending balance	(7)	(10)	(10)
Accumulated other comprehensive income (loss) | SoCalGas
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	(31)	(31)	(23)
OCI before reclassifications	4	(2)	(10)
Amounts reclassified from AOCI	3	2	2
Total other comprehensive income (loss)	7	0	(8)
AOCI, ending balance	$ (24)	$ (31)	$ (31)