SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and maintenance	$ 4,746	$ 4,341	$ 3,941
Earnings from discontinued operations attributable to common shares	0	0	1,840
Gain (loss) on sale of assets	0	36	(3)
Interest expense	(1,054)	(1,198)	(1,081)
Equity earnings	1,498	1,343	1,015
Energy-related businesses	1,788	1,866	1,345
Other income, net	(24)	(58)	48
Income from continuing operations before income taxes and equity earnings	1,343	219	1,489
Income tax benefit (expense)	(556)	(99)	(249)
Income from continuing operations, net of income tax	2,285	1,463	2,255
Earnings attributable to noncontrolling interest	(146)	(145)	(172)
Net income	2,285	1,463	4,105
San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(449)	(412)	(413)
Other income, net	(92)	(64)	(52)
Income from continuing operations before income taxes and equity earnings	1,097	1,020	1,014
Income tax benefit (expense)	(182)	(201)	(190)
Net income	915	819	824
SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(198)	(157)	(158)
Other income, net	8	14	28
Income from continuing operations before income taxes and equity earnings	738	(736)	601
Income tax benefit (expense)	(138)	310	(96)
Net income	600	(426)	505
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	28	80	721
Reclassification out of Accumulated Other Comprehensive Income | San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, net of income tax and after NCI	1	1	1
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	3	2	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	0
Earnings from discontinued operations attributable to common shares	0	0	645
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from discontinued operations attributable to common shares	0	0	6
Other income, net	7	8	8
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]
Other income, net	1	0	1
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	2	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	4	4	4
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]
Other income, net	0	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	1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Settlements Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	0	7	22
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from discontinued operations attributable to common shares	0	0	(2)
Income from continuing operations before income taxes and equity earnings	11	19	40
Income tax benefit (expense)	(3)	(5)	(9)
Income from continuing operations, net of income tax	8	14	29
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits | San Diego Gas and Electric Company
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes and equity earnings	1	1	2
Income tax benefit (expense)	0	0	(1)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	(1)	0	0
Income from continuing operations, net of income tax	3	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]
Other income, net	(12)	6	11
Income from continuing operations before income taxes and equity earnings	16	92	67
Income tax benefit (expense)	(6)	(24)	(19)
Income from continuing operations, net of income tax	10	68	48
Net income	1	0	645
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	2	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	1	11	10
Equity earnings	29	73	46
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]
Energy-related businesses	(1)	1	(1)
Other income, net	1	0	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	(2)	1	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 interest	9	(2)	(1)
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, net of income tax and after NCI	19	66	47
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments | Interest rate instruments | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 1	$ 0	$ 0