SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($) segment	Mar. 31, 2019 segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	May 16, 2019	Dec. 31, 2018 USD ($)		Mar. 09, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | segment	5	6
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,230		$ 2,175	$ 5,128	$ 4,711
INTEREST EXPENSE	258		228	518	434
INTEREST INCOME	21		18	42	47
DEPRECIATION AND AMORTIZATION	389		377	772	749
Income Tax Expense (Benefit)	47		(602)	89	(360)
Equity earnings (losses), before income tax:	2		(189)	7	(184)
Equity earnings, net of income tax:	116		185	212	159
Equity earnings (losses)	118		(4)	219	(25)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	354		(561)	795	(214)
Discontinued operations	70		48	19	69
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				1,651	1,834
ASSETS	62,727			62,727			$ 60,638	[1]
EQUITY METHOD AND OTHER INVESTMENTS	13,012			13,012			11,972
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,094		1,051	2,239	2,106
INTEREST EXPENSE	102		53	205	105
INTEREST INCOME	1		1	2	2
DEPRECIATION AND AMORTIZATION	189		169	375	335
Income Tax Expense (Benefit)	35		42	40	98
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	143		146	319	316
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				708	851
ASSETS	19,888			19,888			19,225
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	806		772	2,167	1,898
INTEREST EXPENSE	34		26	68	53
INTEREST INCOME	1		1	1	1
DEPRECIATION AND AMORTIZATION	148		138	295	273
Income Tax Expense (Benefit)	(4)		23	15	82
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	30		33	294	258
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				659	783
ASSETS	15,767			15,767			15,389
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses), before income tax:	1		0	1	0
Equity earnings, net of income tax:	112		114	206	129
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	113		114	207	129
Segment Reporting Information, Additional Information [Abstract]
ASSETS	11,033			11,033			9,652
EQUITY METHOD AND OTHER INVESTMENTS	11,033			11,033			9,652
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	318		310	701	618
INTEREST EXPENSE	29		30	59	60
INTEREST INCOME	19		16	38	31
DEPRECIATION AND AMORTIZATION	46		43	90	86
Income Tax Expense (Benefit)	44		(55)	116	100
Equity earnings, net of income tax:	4		71	6	30
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	73		97	130	117
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				240	140
ASSETS	9,609			9,609			9,165
EQUITY METHOD AND OTHER INVESTMENTS	729			729			747
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	3		40	10	65
INTEREST EXPENSE	0		5	3	10
INTEREST INCOME	1		2	11	4
DEPRECIATION AND AMORTIZATION	0		14	0	27
Income Tax Expense (Benefit)	14		(58)	4	(65)
Equity earnings (losses), before income tax:	2		(187)	5	(182)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	46		(109)	59	(88)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				2	37
ASSETS	0			0			2,549
EQUITY METHOD AND OTHER INVESTMENTS	0			0			291
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	86		79	227	183
INTEREST EXPENSE	3		7	7	15
INTEREST INCOME	16		13	30	26
DEPRECIATION AND AMORTIZATION	3		11	5	22
Income Tax Expense (Benefit)	2		(506)	6	(494)
Equity earnings (losses), before income tax:	0		1	2	1
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	6		(764)	11	(780)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				40	13
ASSETS	3,736			3,736			4,060
EQUITY METHOD AND OTHER INVESTMENTS	1,244			1,244			1,271
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	110		137	219	249
INTEREST INCOME	0		(3)	1	13
DEPRECIATION AND AMORTIZATION	3		2	7	6
Income Tax Expense (Benefit)	(44)		(48)	(92)	(81)
Equity earnings (losses), before income tax:	(1)		(3)	(1)	(3)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(127)		(126)	(244)	(235)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				2	10
ASSETS	1,196			1,196			1,070
EQUITY METHOD AND OTHER INVESTMENTS	6			6			11
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(1)		(1)	(1)	(2)
Discontinued operations	70		48	19	69
Segment Reporting Information, Additional Information [Abstract]
Discontinued operations	3,898			3,898			3,718
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(76)		(76)	(215)	(157)
INTEREST EXPENSE	(20)		(30)	(43)	(58)
INTEREST INCOME	(17)		(12)	(41)	(30)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,400)			(2,400)			$ (4,190)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	2		1	3	2
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	17		15	34	32
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	32		28	60	57
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 25		$ 32	$ 118	$ 66
Oncor Electric Delivery Company LLC. [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest									80.25%
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%			80.25%
Sharyland Holdings, LP [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest						50.00%
Sharyland Holdings, LP [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Acquired percentage interest						50.00%

[1] Derived from audited financial statements.