GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (311)	$ (317)	$ (616)	$ (683)
Energy-related businesses	373	621	848	1,742
Other income, net	(30)	(31)	(129)	(72)
Income before income taxes and equity earnings	308	523	1,013	1,852
Income tax benefit (expense)	130	(175)	(42)	(551)
Net income	871	736	1,752	1,908
Earnings attributable to noncontrolling interests	(146)	(121)	(215)	(313)
Net income attributable to Sempra	725	615	1,537	1,595
SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(78)	(71)	(155)	(140)
Other income, net	(13)	(1)	(60)	7
Income before income taxes and equity earnings	141	135	543	589
Income tax benefit (expense)	(10)	21	(53)	(73)
Net income	131	156	490	516
Net income attributable to Sempra	131	156	490	516
SDG&E
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(131)	(123)	(259)	(241)
Other income, net	(23)	(22)	(56)	(50)
Income before income taxes and equity earnings	220	188	483	453
Income tax benefit (expense)	(34)	(4)	(74)	(11)
Net income	186	184	409	442
Net income attributable to Sempra	186	184	409	442
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Sempra	(3)	(3)	(7)	(7)
Reclassification out of Accumulated Other Comprehensive Income | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Sempra	1	1	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	(18)	(13)	(31)	(24)
Income tax benefit (expense)	3	0	6	3
Net income	(15)	(13)	(25)	(21)
Net income attributable to Sempra	(10)	(4)	(16)	(9)
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)	0	(6)	0
Equity earnings	(10)	(14)	(15)	(21)
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	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	(2)	1	(4)	2
Energy-related businesses	(2)	0	(5)	0
Other income, net	1	(1)	1	(2)
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]
Other income, net	0	1	0	6
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)
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	5	9	9	12
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(1)	(1)	(3)	(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)
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	(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	10	1	13	2
Income tax benefit (expense)	(3)	0	(4)	0
Net income	$ 7	$ 1	$ 9	$ 2