SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			5
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,741	$ 2,526	$ 6,000	$ 5,555
INTEREST EXPENSE	258	274	517	554
INTEREST INCOME	15	22	34	49
DEPRECIATION AND AMORTIZATION	463	412	905	824
Income tax expense (benefit) from continuing operations	139	168	297	(39)
Equity earnings (losses), before income tax:	185	84	320	41
Equity earnings (losses), net of income tax:	128	149	311	455
Equity earnings	313	233	631	496
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	424	2,239	1,298	2,999
Discontinued operations	0	1,775	0	1,847
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			2,424	2,198
ASSETS	68,608		68,608		$ 66,623	[1]
EQUITY METHOD AND OTHER INVESTMENTS	14,048		14,048		13,828
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,318	1,235	2,655	2,504
INTEREST EXPENSE	101	103	203	204
INTEREST INCOME	0	0	1	1
DEPRECIATION AND AMORTIZATION	220	197	433	398
Income tax expense (benefit) from continuing operations	33	70	78	128
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	186	193	398	455
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			1,072	850
ASSETS	22,980		22,980		22,311
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,124	1,010	2,632	2,405
INTEREST EXPENSE	40	40	79	80
INTEREST INCOME	0	1	0	2
DEPRECIATION AND AMORTIZATION	180	162	353	321
Income tax expense (benefit) from continuing operations	8	49	102	101
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	94	146	501	449
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			936	885
ASSETS	19,091		19,091		18,460
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses), before income tax:	2	0	3	0
Equity earnings (losses), net of income tax:	137	143	273	249
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	138	144	273	249
Segment Reporting Information, Additional Information [Abstract]
ASSETS	12,760		12,760		12,542
EQUITY METHOD AND OTHER INVESTMENTS	12,760		12,760		12,542
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	404	275	771	584
INTEREST EXPENSE	41	32	79	64
INTEREST INCOME	12	15	24	33
DEPRECIATION AND AMORTIZATION	57	47	108	94
Income tax expense (benefit) from continuing operations	113	54	121	(253)
Equity earnings (losses), net of income tax:	(9)	6	38	206
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	4	61	61	252
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			166	321
ASSETS	11,114		11,114		10,752
EQUITY METHOD AND OTHER INVESTMENTS	871		871		852
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	52	69	248	192
INTEREST EXPENSE	3	15	6	31
INTEREST INCOME	8	18	17	40
DEPRECIATION AND AMORTIZATION	2	3	5	5
Income tax expense (benefit) from continuing operations	(19)	18	30	41
Equity earnings (losses), before income tax:	133	84	267	141
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	47	61	193	136
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			249	136
ASSETS	3,078		3,078		2,205
EQUITY METHOD AND OTHER INVESTMENTS	416		416		433
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1	0	2	1
INTEREST EXPENSE	80	102	163	211
INTEREST INCOME	1	3	1	3
DEPRECIATION AND AMORTIZATION	4	3	6	6
Income tax expense (benefit) from continuing operations	4	(23)	(34)	(56)
Equity earnings (losses), before income tax:	50	0	50	(100)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(45)	(141)	(128)	(389)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT			1	6
ASSETS	1,029		1,029		1,209
EQUITY METHOD AND OTHER INVESTMENTS	1		1		1
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(1)	(1)	(1)	(2)
Discontinued operations	0	1,775	0	1,847
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(157)	(62)	(307)	(129)
INTEREST EXPENSE	(7)	(18)	(13)	(36)
INTEREST INCOME	(6)	(15)	(9)	(30)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(1,444)		(1,444)		$ (856)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	2	2	4	3
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	23	20	48	38
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	52	29	62	51
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 80	$ 11	$ 193	$ 37
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.