SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - RECLASSIFICATION FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from discontinued operations attributable to common shares	$ 0	$ 1,840	$ 328
Gain (loss) on sale of assets	36	(3)	63
Interest expense	(1,198)	(1,081)	(1,077)
Equity earnings	1,343	1,015	580
Energy-related businesses	1,866	1,345	1,381
Other (expense) income, net	(58)	48	(77)
Income from continuing operations before income taxes and equity earnings	219	1,489	1,734
Income tax benefit (expense)	(99)	(249)	(315)
Income from continuing operations, net of income tax	1,463	2,255	1,999
Earnings attributable to noncontrolling interest	(145)	(172)	(164)
San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(412)	(413)	(411)
Other (expense) income, net	(64)	(52)	(39)
Income from continuing operations before income taxes and equity earnings	1,020	1,014	945
Income tax benefit (expense)	(201)	(190)	(171)
Earnings attributable to noncontrolling interest	0	0	(7)
SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(157)	(158)	(141)
Other (expense) income, net	14	28	55
Income from continuing operations before income taxes and equity earnings	(736)	601	762
Income tax benefit (expense)	310	(96)	(120)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss) Attributable to Parent	80	721	40
Reclassification out of Accumulated Other Comprehensive Income | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss) Attributable to Parent	1	1	1
Reclassification out of Accumulated Other Comprehensive Income | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss) Attributable to Parent	2	2	1
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from discontinued operations attributable to common shares	0	645	0
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes and equity earnings	92	67	11
Income tax benefit (expense)	(24)	(19)	(2)
Income from continuing operations, net of income tax	68	48	9
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments | Interest rate instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain (loss) on sale of assets	0	0	10
Interest expense	11	10	3
Equity earnings	73	46	3
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments | Interest rate instruments | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0	0	3
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments | Foreign exchange instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Equity earnings	0	0	2
Energy-related businesses	1	(1)	2
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments | Interest rate and foreign exchange instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	1	1	0
Other (expense) income, net	6	11	(9)
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments attributable to Noncontrolling interests
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to noncontrolling interest	(2)	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments attributable to Noncontrolling interests | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings attributable to noncontrolling interest	0	0	(3)
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss) Attributable to Parent	66	47	8
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments attributable to parent | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss) Attributable to Parent	0	0	0
Reclassification out of Accumulated Other Comprehensive Income | Financial instruments attributable to parent | Interest rate instruments | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0	0	1
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	6	1
Other (expense) income, net	8	8	12
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	0	1	0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss | SoCalGas
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	1	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 (expense) income, net	4	4	3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	1	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 (expense) income, net	1	1	0
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 (expense) income, net	7	22	28
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	(2)	0
Income from continuing operations before income taxes and equity earnings	19	40	44
Income tax benefit (expense)	(5)	(9)	(12)
Income from continuing operations, net of income tax	14	29	32
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits | San Diego Gas and Electric Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes and equity earnings	1	2	1
Income tax benefit (expense)	0	(1)	0
Income from continuing operations, net of income tax	1	1	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 from continuing operations before income taxes and equity earnings	2	2	1
Income tax benefit (expense)	0	0	(1)
Income from continuing operations, net of income tax	$ 2	$ 2	$ 0