GENERAL INFORMATION AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 382	$ 433
Equity earnings	(367)	(325)
Energy-related businesses	(406)	(381)
Income before income taxes and equity earnings	(848)	(651)
Other income, net	(100)	(91)
Income tax expense (benefit)	65	57
Net income	(1,150)	(919)
Total, net of income tax and after NCI	(1,037)	(917)
SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	97	90
Income before income taxes and equity earnings	(444)	(481)
Other income, net	(43)	(42)
Income tax expense (benefit)	20	38
Net income	(424)	(443)
Total, net of income tax and after NCI	(424)	(443)
SDG&E
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	147	135
Income before income taxes and equity earnings	(365)	(295)
Other income, net	(38)	(40)
Income tax expense (benefit)	69	14
Net income	(296)	(281)
Total, net of income tax and after NCI	(296)	(281)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, net of income tax and after NCI	(2)	4
Reclassification out of Accumulated Other Comprehensive Income | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, net of income tax and after NCI	0	4
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	(6)	(3)
Income tax expense (benefit)	1	1
Net income	(5)	(2)
Total, net of income tax and after NCI	(3)	(1)
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)
Equity earnings	(1)	(5)
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)	2
Energy-related businesses	(2)	2
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]
Net income, Non-controlling interest (after tax)	2	1
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	2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	0	1
Reclassification out of Accumulated Other Comprehensive Income | Settlement charges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	0	4
Reclassification out of Accumulated Other Comprehensive Income | Settlement charges | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	0	4
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	1	6
Income tax expense (benefit)	0	(1)
Net income	1	5
Reclassification out of Accumulated Other Comprehensive Income | Pension and PBOP | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes and equity earnings	0	5
Income tax expense (benefit)	0	(1)
Net income	$ 0	$ 4