SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			5
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 3,013	$ 2,644	$ 9,013	$ 8,199
INTEREST EXPENSE	259	264	776	818
INTEREST INCOME	16	27	50	76
DEPRECIATION AND AMORTIZATION	471	418	1,376	1,242
Income Tax Expense (Benefit)	(342)	99	(45)	60
Equity earnings (losses), before income tax:	137	117	457	158
Equity earnings, net of income tax:	254	209	565	664
Equity earnings	391	326	1,022	822
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(648)	351	650	3,350
Discontinued operations	0	(7)	0	1,840
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			3,606	3,313
ASSETS	70,472		70,472		$ 66,623	[1]
EQUITY METHOD AND OTHER INVESTMENTS	13,958		13,958		13,828
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,464	1,472	4,119	3,976
INTEREST EXPENSE	104	103	307	307
INTEREST INCOME	0	1	1	2
DEPRECIATION AND AMORTIZATION	226	200	659	598
Income Tax Expense (Benefit)	90	33	168	161
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	205	178	603	633
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			1,560	1,323
ASSETS	23,783		23,783		22,311
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,106	842	3,738	3,247
INTEREST EXPENSE	39	39	118	119
INTEREST INCOME	0	0	0	2
DEPRECIATION AND AMORTIZATION	180	165	533	486
Income Tax Expense (Benefit)	(437)	(6)	(335)	95
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(1,126)	(24)	(625)	425
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			1,417	1,345
ASSETS	19,919		19,919		18,460
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses), before income tax:	0	1	3	1
Equity earnings, net of income tax:	207	208	480	457
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	206	209	479	458
Segment Reporting Information, Additional Information [Abstract]
ASSETS	12,580		12,580		12,542
EQUITY METHOD AND OTHER INVESTMENTS	12,580		12,580		12,542
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	597	351	1,368	935
INTEREST EXPENSE	43	31	122	95
INTEREST INCOME	12	14	36	47
DEPRECIATION AND AMORTIZATION	60	47	168	141
Income Tax Expense (Benefit)	24	92	145	(161)
Equity earnings, net of income tax:	47	1	85	207
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	164	50	225	302
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			260	443
ASSETS	11,339		11,339		10,752
EQUITY METHOD AND OTHER INVESTMENTS	924		924		852
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	119	63	367	255
INTEREST EXPENSE	4	8	10	39
INTEREST INCOME	6	25	23	65
DEPRECIATION AND AMORTIZATION	3	2	8	7
Income Tax Expense (Benefit)	(11)	18	19	59
Equity earnings (losses), before income tax:	137	116	404	257
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	1	71	194	207
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			362	196
ASSETS	3,335		3,335		2,205
EQUITY METHOD AND OTHER INVESTMENTS	454		454		433
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	2	0	4	1
INTEREST EXPENSE	77	93	240	304
INTEREST INCOME	1	0	2	3
DEPRECIATION AND AMORTIZATION	2	4	8	10
Income Tax Expense (Benefit)	(8)	(38)	(42)	(94)
Equity earnings (losses), before income tax:	0	0	50	(100)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(98)	(126)	(226)	(515)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			7	6
ASSETS	1,094		1,094		1,209
EQUITY METHOD AND OTHER INVESTMENTS	0		0		1
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	0	2	(1)	0
Discontinued operations	0	(7)	0	1,840
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(275)	(86)	(582)	(215)
INTEREST EXPENSE	(8)	(10)	(21)	(46)
INTEREST INCOME	(3)	(13)	(12)	(43)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(1,578)		(1,578)		$ (856)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	3	1	7	4
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	24	23	72	61
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	52	18	114	69
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 196	$ 44	$ 389	$ 81
Oncor Electric Delivery Company LLC Additional Acquisition [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest	80.25%		80.25%
Sharyland Holdings, LP [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest	50.00%		50.00%

[1] Derived from audited financial statements.