GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (328)	$ (312)	$ (944)	$ (995)
Energy-related businesses	512	596	1,360	2,338
Other income, net	65	3	194	75
Income before income taxes and equity earnings	200	323	1,213	2,175
Income tax benefit (expense)	105	52	63	(499)
Net income	759	854	2,511	2,762
Earnings attributable to noncontrolling interests	(110)	(122)	(325)	(435)
Net income attributable to Sempra	649	732	2,186	2,327
SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(82)	(70)	(237)	(210)
Other income, net	13	(2)	73	(9)
Income before income taxes and equity earnings	(66)	11	477	600
Income tax benefit (expense)	52	5	(1)	(68)
Net income	(14)	16	476	532
Net income attributable to Sempra	(14)	16	476	532
SDG&E
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(131)	(126)	(390)	(367)
Other income, net	30	25	86	75
Income before income taxes and equity earnings	276	259	759	712
Income tax benefit (expense)	(15)	15	(89)	4
Net income	261	274	670	716
Net income attributable to Sempra	261	274	670	716
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Sempra	(3)	(4)	(10)	(11)
Reclassification out of Accumulated Other Comprehensive Income | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Sempra			2	2
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	(10)	(13)	(41)	(37)
Income tax benefit (expense)	3	2	9	5
Net income	(7)	(11)	(32)	(32)
Net income attributable to Sempra	(5)	(5)	(21)	(14)
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	(3)	1	(9)	1
Equity earnings	(5)	(12)	(20)	(33)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest rate instruments | SoCalGas
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)	(1)	(5)	1
Energy-related businesses			(5)	0
Other income, net	(1)	(1)	(2)	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			0	(1)
Other income, net			0	(6)
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	2	6	11	18
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	1	5	2
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	2	2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net			1	1
Reclassification out of Accumulated Other Comprehensive Income | Settlement charges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net			9	0
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	3	2	16	4
Income tax benefit (expense)	(1)	(1)	(5)	(1)
Net income	$ 2	$ 1	$ 11	$ 3