SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)		May 16, 2019
Segment Reporting Information [Line Items]
Number of reportable segments | segment	5
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 3,259	$ 3,029
INTEREST EXPENSE	259	280
INTEREST INCOME	19	27
DEPRECIATION AND AMORTIZATION	442	412
Income tax expense (benefit) from continuing operations	158	(207)
Equity earnings (losses), before income tax:	135	(43)
Equity earnings, net of income tax:	183	306
Equity earnings	318	263
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	874	760
Discontinued operations	0	72
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	1,181	1,010
ASSETS	67,821		$ 66,623	[1]
EQUITY METHOD AND OTHER INVESTMENTS	14,058		13,828
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,337	1,269
INTEREST EXPENSE	102	101
INTEREST INCOME	1	1
DEPRECIATION AND AMORTIZATION	213	201
Income tax expense (benefit) from continuing operations	45	58
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	212	262
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	555	402
ASSETS	22,474		22,311
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,508	1,395
INTEREST EXPENSE	39	40
INTEREST INCOME	0	1
DEPRECIATION AND AMORTIZATION	173	159
Income tax expense (benefit) from continuing operations	94	52
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	407	303
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	459	388
ASSETS	18,981		18,460
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses), before income tax:	1	0
Equity earnings, net of income tax:	136	106
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	135	105
Segment Reporting Information, Additional Information [Abstract]
ASSETS	12,656		12,542
EQUITY METHOD AND OTHER INVESTMENTS	12,656		12,542
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	367	309
INTEREST EXPENSE	38	32
INTEREST INCOME	12	18
DEPRECIATION AND AMORTIZATION	51	47
Income tax expense (benefit) from continuing operations	8	(307)
Equity earnings, net of income tax:	47	200
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	57	191
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	77	170
ASSETS	11,177		10,752
EQUITY METHOD AND OTHER INVESTMENTS	888		852
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	196	123
INTEREST EXPENSE	3	16
INTEREST INCOME	9	22
DEPRECIATION AND AMORTIZATION	3	2
Income tax expense (benefit) from continuing operations	49	23
Equity earnings (losses), before income tax:	134	57
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	146	75
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	89	47
ASSETS	2,786		2,205
EQUITY METHOD AND OTHER INVESTMENTS	513		433
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1	1
INTEREST EXPENSE	83	109
DEPRECIATION AND AMORTIZATION	2	3
Income tax expense (benefit) from continuing operations	(38)	(33)
Equity earnings (losses), before income tax:	0	(100)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(83)	(248)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	1	3
ASSETS	933		1,209
EQUITY METHOD AND OTHER INVESTMENTS	1		1
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	0	(1)
Discontinued operations	0	72
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(150)	(67)
INTEREST EXPENSE	(6)	(18)
INTEREST INCOME	(3)	(15)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(1,186)		$ (856)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	2	1
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	25	18
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	10	22
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 113	$ 26
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest	80.25%
Sharyland Holdings, LP [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest					50.00%

[1] Derived from audited financial statements.