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SEGMENT INFORMATION (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)		Jun. 25, 2018	Mar. 09, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | segment	7
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	$ 11,687	$ 11,207		$ 10,183
Segment reporting information, Interest Expense	925	659	[1]	553	[1]
Segment reporting information, Interest Income	104	46	[1]	26	[1]
Segment reporting information, Depreciation and Amortization	1,549	1,490		1,312
Income tax expense	96	1,276	[1]	389	[1]
Earnings attributable to common shares	924	256	[1]	1,370	[1]
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	3,784	3,949		4,214
Segment reporting information, Assets	60,638	50,454		47,786
Assets, geographical	48,785	39,030		35,028
Entity-Wide Disclosure On Geographic Areas, United States [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	8,840	8,547		8,004
Segment Reporting Information, Additional Information [Abstract]
Assets, geographical	40,611	31,487		28,351
Entity-Wide Disclosure On Geographic Areas Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	1,262	1,093		623
Segment Reporting Information, Additional Information [Abstract]
Assets, geographical	5,800	5,363		4,814
Entity-Wide Disclosure On Geographic Areas, South America [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	1,585	1,567		1,556
Segment Reporting Information, Additional Information [Abstract]
Assets, geographical	2,374	2,180		1,863
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	4,568	4,476		4,253
Segment reporting information, Interest Expense	221	203		195
Segment reporting information, Interest Income	4	0		0
Segment reporting information, Depreciation and Amortization	688	670		646
Income tax expense	173	155		280
Earnings attributable to common shares	669	407		570
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	1,542	1,555		1,399
Segment reporting information, Assets	19,225	17,844		17,719
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	3,962	3,785		3,471
Segment reporting information, Interest Expense	115	102		97
Segment reporting information, Interest Income	2	1		1
Segment reporting information, Depreciation and Amortization	556	515		476
Income tax expense	92	160		143
Earnings attributable to common shares	400	396		349
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	1,538	1,367		1,319
Segment reporting information, Assets	15,389	14,159		13,424
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Earnings attributable to common shares	371	0		0
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Assets	9,652	0		0
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	1,585	1,567		1,556
Segment reporting information, Interest Expense	40	38		38
Segment reporting information, Interest Income	31	28		21
Segment reporting information, Depreciation and Amortization	58	54		49
Income tax expense	95	80		80
Earnings attributable to common shares	199	186		156
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	240	244		194
Segment reporting information, Assets	4,107	4,060		3,591
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	1,376	1,196		725
Segment reporting information, Interest Expense	120	97		13
Segment reporting information, Interest Income	65	23		6
Segment reporting information, Depreciation and Amortization	175	156		77
Income tax expense	185	227		188
Earnings attributable to common shares	237	169		463
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	368	248		330
Segment reporting information, Assets	9,165	8,554		7,542
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	124	94		34
Segment reporting information, Interest Expense	19	15		4
Segment reporting information, Interest Income	12	7		5
Segment reporting information, Depreciation and Amortization	27	38		6
Income tax expense	71	(226)		(38)
Earnings attributable to common shares	328	252		55
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	51	497		835
Segment reporting information, Assets	2,549	2,898		3,644
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	472	540		508
Segment reporting information, Interest Expense	21	39		43
Segment reporting information, Interest Income	49	56		71
Segment reporting information, Depreciation and Amortization	26	42		47
Income tax expense	(435)	(119)		(80)
Earnings attributable to common shares	(617)	150		(107)
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	31	20		117
Segment reporting information, Assets	4,060	4,872		5,564
Adjustment and Elimination [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	(3)	(1)		0
Intersegment Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	(397)	(450)		(364)
Segment reporting information, Interest Expense	(107)	(119)		(119)
Segment reporting information, Interest Income	(73)	(69)		(78)
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Assets	(4,240)	(2,848)		(4,173)
Intersegment Eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	4	7		6
Intersegment Eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	64	74		76
Intersegment Eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	114	103		102
Intersegment Eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenue	215	266		180
All Other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Interest Expense	496	284		282
Segment reporting information, Interest Income	14	0		0
Segment reporting information, Depreciation and Amortization	19	15		11
Income tax expense	(85)	999		(184)
Earnings attributable to common shares	(663)	(1,304)		(116)
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information Expenditures For Property Plant and Equipment	14	18		20
Segment reporting information, Assets	$ 731	$ 915		$ 475
Oncor Electric Delivery Company LLC [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest							80.25%
Oncor Holdings Electric Delivery Company LLC [Member] | Oncor Electric Delivery Company LLC [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%
Disposal Group Held-for-sale [Member] | Bay Gas [Member] | Non-utility Natural gas Storage Assets [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information [Line Items]
Ownership interest						90.90%
[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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