SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 16, 2019	Mar. 09, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | segment				6					5
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										$ 10,829	$ 10,102	$ 9,640
Segment reporting information, Interest Expense										1,077	886	622
Segment reporting information, Interest Income										87	85	24
Segment reporting information, Depreciation and Amortization										1,569	1,491	1,436
Income tax expense (benefit) from continuing operations										315	(49)	938
Earnings attributable to common shares										2,055	924	256
(Loss) income from discontinued operations, net of income tax	$ 71	$ 256	$ 78	$ (42)	$ 51	$ 54	$ 55	$ 28		328	156	(58)
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										3,708	3,544	3,705
Segment reporting information, Assets	65,665				60,638				$ 65,665	65,665	60,638	50,454
Assets, geographical	50,074				46,411				50,074	50,074	46,411	36,850
Entity-Wide Disclosure On Geographic Areas, United States [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										9,574	8,840	8,547
Segment Reporting Information, Additional Information [Abstract]
Assets, geographical	43,719				40,611				43,719	43,719	40,611	31,487
Entity-Wide Disclosure On Geographic Areas Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										1,255	1,262	1,093
Segment Reporting Information, Additional Information [Abstract]
Assets, geographical	6,355				5,800				6,355	6,355	5,800	5,363
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										4,925	4,568	4,476
Segment reporting information, Interest Expense										411	221	203
Segment reporting information, Interest Income										4	4	0
Segment reporting information, Depreciation and Amortization										760	688	670
Income tax expense (benefit) from continuing operations										171	173	155
Earnings attributable to common shares										767	669	407
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										1,522	1,542	1,555
Segment reporting information, Assets	20,560				19,225				20,560	20,560	19,225	17,844
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										4,525	3,962	3,785
Segment reporting information, Interest Expense										141	115	102
Segment reporting information, Interest Income										2	2	1
Segment reporting information, Depreciation and Amortization										602	556	515
Income tax expense (benefit) from continuing operations										120	92	160
Earnings attributable to common shares										641	400	396
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										1,439	1,538	1,367
Segment reporting information, Assets	17,077				15,389				17,077	17,077	15,389	14,159
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Earnings attributable to common shares										528	371	0
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Assets	11,619				9,652				11,619	11,619	9,652	0
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										1,375	1,376	1,196
Segment reporting information, Interest Expense										119	120	97
Segment reporting information, Interest Income										78	65	23
Segment reporting information, Depreciation and Amortization										183	175	156
Income tax expense (benefit) from continuing operations										227	185	227
Earnings attributable to common shares										253	237	169
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										624	368	248
Segment reporting information, Assets	9,938				9,165				9,938	9,938	9,165	8,554
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										10	124	94
Segment reporting information, Interest Expense										3	19	15
Segment reporting information, Interest Income										11	12	7
Segment reporting information, Depreciation and Amortization										0	27	38
Income tax expense (benefit) from continuing operations										4	71	(226)
Earnings attributable to common shares										59	328	252
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										2	51	497
Segment reporting information, Assets	0				2,549				0	0	2,549	2,898
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										410	472	540
Segment reporting information, Interest Expense										35	21	39
Segment reporting information, Interest Income										61	49	56
Segment reporting information, Depreciation and Amortization										10	26	42
Income tax expense (benefit) from continuing operations										(5)	(435)	(119)
Earnings attributable to common shares										(6)	(617)	150
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										112	31	20
Segment reporting information, Assets	3,901				4,060				3,901	3,901	4,060	4,872
Adjustment and Elimination [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										(3)	(3)	(1)
(Loss) income from discontinued operations, net of income tax										328	156	(58)
Segment Reporting Information, Additional Information [Abstract]
Assets held for sale	3,958				3,718				3,958	3,958	3,718	3,561
Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										(416)	(397)	(450)
Segment reporting information, Interest Expense										(82)	(106)	(118)
Segment reporting information, Interest Income										(73)	(61)	(63)
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Assets	(2,137)				(4,190)				(2,137)	(2,137)	(4,190)	(2,785)
Intersegment Eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										5	4	7
Intersegment Eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										69	64	74
Intersegment Eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										120	114	103
Intersegment Eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										222	215	266
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue										3	0	0
Segment reporting information, Interest Expense										450	496	284
Segment reporting information, Interest Income										4	14	0
Segment reporting information, Depreciation and Amortization										14	19	15
Income tax expense (benefit) from continuing operations										(202)	(135)	741
Earnings attributable to common shares										(515)	(620)	(1,060)
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment										9	14	18
Segment reporting information, Assets	$ 749				$ 1,070				$ 749	$ 749	$ 1,070	$ 1,351
Oncor Electric Delivery Company LLC [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest														80.25%
Oncor Electric Delivery Holdings Company LLC [Member] | Oncor Electric Delivery Company LLC [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%								80.25%	80.25%
Sharyland Holdings, LP [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest													50.00%
Sharyland Holdings, LP [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest													50.00%