SEGMENT INFORMATION (Details) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 29, 2020	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($) segment	Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)		May 16, 2019
Segment Reporting Information [Line Items]
Number of reportable segments | segment		5	6	5
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		$ 3,029	$ 2,898
INTEREST EXPENSE		280	260
INTEREST INCOME		27	21
DEPRECIATION AND AMORTIZATION		412	383
Income tax (benefit) expense from continuing operations		(207)	42
Equity earnings (losses), before income tax:		(43)	5
Equity earnings, net of income tax:		306	96
Equity earnings		263	101
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		760	441
Discontinued operations		72	(51)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		1,010	783
ASSETS		68,293		$ 68,293	$ 65,665	[1]
EQUITY METHOD AND OTHER INVESTMENTS		13,834		13,834	13,622
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		1,269	1,145
INTEREST EXPENSE		101	103
INTEREST INCOME		1	1
DEPRECIATION AND AMORTIZATION		201	186
Income tax (benefit) expense from continuing operations		58	5
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		262	176
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		402	356
ASSETS		20,784		20,784	20,560
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		1,395	1,361
INTEREST EXPENSE		40	34
INTEREST INCOME		1	0
DEPRECIATION AND AMORTIZATION		159	147
Income tax (benefit) expense from continuing operations		52	19
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		303	264
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		388	324
ASSETS		17,610		17,610	17,077
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings, net of income tax:		106	94
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		105	94
Segment Reporting Information, Additional Information [Abstract]
ASSETS		11,741		11,741	11,619
EQUITY METHOD AND OTHER INVESTMENTS		11,735		11,735	11,619
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		309	383
INTEREST EXPENSE		32	30
INTEREST INCOME		18	19
DEPRECIATION AND AMORTIZATION		47	44
Income tax (benefit) expense from continuing operations		(307)	72
Equity earnings, net of income tax:		200	2
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		191	57
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		170	85
ASSETS		10,627		10,627	9,938
EQUITY METHOD AND OTHER INVESTMENTS		914		914	741
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		0	7
INTEREST EXPENSE		0	3
INTEREST INCOME		0	10
Income tax (benefit) expense from continuing operations		0	(10)
Equity earnings (losses), before income tax:		0	3
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		0	13
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		123	141
INTEREST EXPENSE		16	4
INTEREST INCOME		22	14
DEPRECIATION AND AMORTIZATION		2	2
Income tax (benefit) expense from continuing operations		23	4
Equity earnings (losses), before income tax:		57	2
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		75	5
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		47	18
ASSETS		3,919		3,919	3,901
EQUITY METHOD AND OTHER INVESTMENTS		1,184		1,184	1,256
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		1	0
INTEREST EXPENSE		109	109
INTEREST INCOME		0	1
DEPRECIATION AND AMORTIZATION		3	4
Income tax (benefit) expense from continuing operations		(33)	(48)
Equity earnings (losses), before income tax:		(100)	0
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES		(248)	(117)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT		3	0
ASSETS		1,826		1,826	749
EQUITY METHOD AND OTHER INVESTMENTS		1		1	6
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		(1)	0
Discontinued operations		72	(51)
Segment Reporting Information, Additional Information [Abstract]
Discontinued operations		3,930		3,930	3,958
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		(67)	(139)
INTEREST EXPENSE		(18)	(23)
INTEREST INCOME		(15)	(24)
Segment Reporting Information, Additional Information [Abstract]
ASSETS		(2,144)		$ (2,144)	$ (2,137)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		1	1
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		18	17
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		29	28
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES		$ 19	$ 93
Oncor Electric Delivery Company LLC. [Member]
Segment Reporting Information, Additional Information [Abstract]
Ownership percentage in consolidated entity	19.75%
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Ownership interest (as a percent)		80.25%		80.25%
Oncor Electric Delivery Company LLC. [Member] | TTHC [Member]
Segment Reporting Information, Additional Information [Abstract]
Ownership percentage in consolidated entity	19.75%
Sharyland Holdings, LP [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest							50.00%
TTHC [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Segment Reporting Information [Line Items]
Additional ownership percentage	1.00%

[1] Derived from audited financial statements.