SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) segment	Mar. 31, 2019 segment	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2019 USD ($)	Sep. 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		5
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,758		$ 2,565		$ 7,886	$ 7,276
INTEREST EXPENSE	279		222		797	656
INTEREST INCOME	22		19		64	66
DEPRECIATION AND AMORTIZATION	402		366		1,174	1,115
Income tax expense (benefit) from continuing operations	61		139		150	(221)
Equity earnings (losses), before income tax:	17		(52)		24	(236)
Equity earnings (losses), net of income tax:	249		126		461	285
Equity earnings	266		74		485	49
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	813		274		1,608	60
Discontinued operations	248		46		267	115
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					2,590	2,654
ASSETS	64,585			$ 64,585	64,585			$ 60,638	[1]
EQUITY METHOD AND OTHER INVESTMENTS	13,221			13,221	13,221			11,972
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,427		1,299		3,666	3,405
INTEREST EXPENSE	106		56		311	161
INTEREST INCOME	1		1		3	3
DEPRECIATION AND AMORTIZATION	196		174		571	509
Income tax expense (benefit) from continuing operations	71		53		111	151
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	263		205		582	521
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					1,071	1,194
ASSETS	20,336			20,336	20,336			19,225
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	975		802		3,142	2,700
INTEREST EXPENSE	36		29		104	82
INTEREST INCOME	0		0		1	1
DEPRECIATION AND AMORTIZATION	154		141		449	414
Income tax expense (benefit) from continuing operations	35		(7)		50	75
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	143		(14)		437	244
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					1,019	1,127
ASSETS	16,023			16,023	16,023			15,389
Operating Segments [Member] | Sempra Texas Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses), before income tax:	0		0		1	0
Equity earnings (losses), net of income tax:	212		154		418	283
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	212		154		419	283
Segment Reporting Information, Additional Information [Abstract]
ASSETS	11,248			11,248	11,248			9,652
EQUITY METHOD AND OTHER INVESTMENTS	11,248			11,248	11,248			9,652
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	357		410		1,058	1,028
INTEREST EXPENSE	30		30		89	90
INTEREST INCOME	20		17		58	48
DEPRECIATION AND AMORTIZATION	46		45		136	131
Income tax expense (benefit) from continuing operations	0		126		116	226
Equity earnings (losses), net of income tax:	37		(28)		43	2
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	84		44		214	161
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					420	255
ASSETS	9,759			9,759	9,759			9,165
EQUITY METHOD AND OTHER INVESTMENTS	750			750	750			747
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	0		38		10	103
INTEREST EXPENSE	0		5		3	15
INTEREST INCOME	0		2		11	6
DEPRECIATION AND AMORTIZATION	0		0		0	27
Income tax expense (benefit) from continuing operations	0		(2)		4	(67)
Equity earnings (losses), before income tax:	0		12		5	(170)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	0		34		59	(54)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					2	46
ASSETS	0			0	0			2,549
EQUITY METHOD AND OTHER INVESTMENTS	0			0	0			291
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	100		147		327	330
INTEREST EXPENSE	11		3		18	18
INTEREST INCOME	15		10		45	36
DEPRECIATION AND AMORTIZATION	2		2		7	24
Income tax expense (benefit) from continuing operations	(2)		6		4	(488)
Equity earnings (losses), before income tax:	17		0		19	1
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	2		16		13	(764)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					74	19
ASSETS	3,755			3,755	3,755			4,060
EQUITY METHOD AND OTHER INVESTMENTS	1,216			1,216	1,216			1,271
Corporate, Non-Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1		0		1	0
INTEREST EXPENSE	117		122		336	371
INTEREST INCOME	1		1		2	14
DEPRECIATION AND AMORTIZATION	4		4		11	10
Income tax expense (benefit) from continuing operations	(43)		(37)		(135)	(118)
Equity earnings (losses), before income tax:	0		(64)		(1)	(67)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(139)		(211)		(383)	(446)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT					4	13
ASSETS	1,585			1,585	1,585			1,070
EQUITY METHOD AND OTHER INVESTMENTS	7			7	7			11
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(2)		0		(3)	(2)
Discontinued operations	248		46		267	115
Segment Reporting Information, Additional Information [Abstract]
Discontinued operations	4,115			4,115	4,115			3,718
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(100)		(131)		(315)	(288)
INTEREST EXPENSE	(21)		(23)		(64)	(81)
INTEREST INCOME	(15)		(12)		(56)	(42)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,236)			$ (2,236)	(2,236)			$ (4,190)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1		1		4	3
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	16		15		50	47
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	29		31		89	88
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 54		$ 84		$ 172	$ 150
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 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%

[1] Derived from audited financial statements.