GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and Maintenance	$ 1,206	$ 1,073	$ 3,454	$ 3,098
Interest expense	(282)	(259)	(796)	(776)
Equity earnings	417	391	1,118	1,022
Energy-related businesses	673	453	1,710	1,174
Other Income, Net	(40)	(55)	(3)	52
Income (loss) before income taxes and equity earnings	165	(1,365)	1,194	(316)
Income tax (expense) benefit	(21)	342	(435)	45
Net income (loss)	561	(632)	1,877	751
Earnings Attributable to Noncontrolling Interests	(65)	(5)	(187)	(48)
San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(113)	(104)	(333)	(307)
Other Income, Net	12	4	68	61
Income (loss) before income taxes and equity earnings	306	295	822	771
Income tax (expense) benefit	(35)	(90)	(141)	(168)
Net income (loss)			681	603
Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(50)	(39)	(135)	(118)
Other Income, Net	(43)	(39)	(5)	(2)
Income (loss) before income taxes and equity earnings	(110)	(1,563)	415	(959)
Income tax (expense) benefit	28	437	(75)	335
Net income (loss)	(82)	(1,126)	340	(624)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to common shares	7	19	27	57
Reclassification out of Accumulated Other Comprehensive Income | San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to common shares	1	1	1	1
Reclassification out of Accumulated Other Comprehensive Income | Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to common shares	1	1	3	2
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and Maintenance			1	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes and equity earnings	6	23	23	63
Income tax (expense) benefit	(2)	(7)	(7)	(16)
Net income (loss)	4	16	16	47
Earnings attributable to common shares	5	16	20	45
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)			2	2
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest rate instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	2	(1)	1	0
Equity earnings	1	19	28	57
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest rate instruments | Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense			1	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Foreign exchange instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Equity earnings			(1)	1
Energy-related businesses			(2)	1
Other Income, Net			1	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest rate and foreign exchange instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense			(1)	0
Other Income, Net	3	5	(3)	4
Reclassification out of Accumulated Other Comprehensive Income | Gains (Losses) on Cash Flow hedges Attributable to Noncontrolling Interests
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings Attributable to Noncontrolling Interests	1	0	4	(2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income, Net	2	3	6	6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss | San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	1	0	1	0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss | Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	0	1	1	1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income, Net	1	1	3	3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost | San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	0	1	0	1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost | Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	1	0	1	1
Reclassification out of Accumulated Other Comprehensive Income | Settlement charges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income, Net			0	7
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes and equity earnings	3	4	9	16
Income tax (expense) benefit	(1)	(1)	(3)	(4)
Net income (loss)	$ 2	$ 3	$ 6	$ 12