GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and Maintenance	$ 1,383	$ 1,206	$ 3,958	$ 3,454
Interest expense	(312)	(282)	(995)	(796)
Energy-related businesses	596	673	2,338	1,710
Other Income (Expense), Net	3	(40)	75	(3)
Income before income taxes and equity earnings	323	165	2,175	1,194
Income tax benefit (expense)	52	(21)	(499)	(435)
Net income	854	561	2,762	1,877
Earnings Attributable to Noncontrolling Interests	(122)	(65)	(435)	(187)
Southern California Gas Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(70)	(50)	(210)	(135)
Other Income (Expense), Net	(2)	(43)	(9)	(5)
Income before income taxes and equity earnings	11	(110)	600	415
Income tax benefit (expense)	5	28	(68)	(75)
Net income	16	(82)	532	340
San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(126)	(113)	(367)	(333)
Other Income (Expense), Net	25	12	75	68
Income before income taxes and equity earnings	259	306	712	822
Income tax benefit (expense)	15	(35)	4	(141)
Net income	274	271	716	681
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to common shares	(4)	7	(11)	27
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	0	1	2	3
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	0	1	0	1
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and Maintenance			0	1
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 before income taxes and equity earnings	(13)	6	(37)	23
Income tax benefit (expense)	2	(2)	5	(7)
Net income	(11)	4	(32)	16
Earnings attributable to common shares	(5)	5	(14)	20
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			1	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	1	2	1	1
Equity earnings	(12)	1	(33)	28
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	1
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)	0	1	(1)
Energy-related businesses			0	(2)
Other Income (Expense), Net	(1)	0	1	1
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)	(1)
Other Income (Expense), Net	0	3	(6)	(3)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings Attributable to Noncontrolling Interests	6	1	18	4
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income (Expense), Net	1	2	2	6
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
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	0	1	0	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 (Expense), Net	1	1	2	3
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	0	1	1	1
Reclassification out of Accumulated Other Comprehensive Income | Pension and PBOP
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes and equity earnings	2	3	4	9
Income tax benefit (expense)	(1)	(1)	(1)	(3)
Net income	$ 1	$ 2	$ 3	$ 6