SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment facility	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Wind generation facility | facility	1
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,898	$ 2,536
INTEREST EXPENSE	260	206
INTEREST INCOME	21	29
DEPRECIATION AND AMORTIZATION	383	372
Income Tax Expense (Benefit)	42	242
Equity earnings before income tax:	5	5
Equity earnings (losses) net of income tax:	96	(26)
Equity earnings (losses)	101	(21)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	441	347
Discontinued operations	(51)	21
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	783	979
ASSETS	61,618		$ 60,638	[1]
EQUITY METHOD AND OTHER INVESTMENTS	12,038		11,972
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,145	1,055
INTEREST EXPENSE	103	52
INTEREST INCOME	1	1
DEPRECIATION AND AMORTIZATION	186	166
Income Tax Expense (Benefit)	5	56
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	176	170
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	356	475
ASSETS	19,558		19,225
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,361	1,126
INTEREST EXPENSE	34	27
DEPRECIATION AND AMORTIZATION	147	135
Income Tax Expense (Benefit)	19	59
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	264	225
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	324	403
ASSETS	15,904		15,389
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity earnings (losses) net of income tax:	94	15
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	94	15
Segment Reporting Information, Additional Information [Abstract]
ASSETS	9,748		9,652
EQUITY METHOD AND OTHER INVESTMENTS	9,748		9,652
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	383	308
INTEREST EXPENSE	30	30
INTEREST INCOME	19	15
DEPRECIATION AND AMORTIZATION	44	43
Income Tax Expense (Benefit)	72	155
Equity earnings (losses) net of income tax:	2	(41)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	57	20
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	85	59
ASSETS	9,382		9,165
EQUITY METHOD AND OTHER INVESTMENTS	737		747
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	7	25
INTEREST EXPENSE	3	5
INTEREST INCOME	10	2
DEPRECIATION AND AMORTIZATION	0	13
Income Tax Expense (Benefit)	(10)	(7)
Equity earnings before income tax:	3	5
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	13	21
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	0	31
ASSETS	1,310		2,549
EQUITY METHOD AND OTHER INVESTMENTS	290		291
Operating Segments [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	141	104
INTEREST EXPENSE	4	8
INTEREST INCOME	14	13
DEPRECIATION AND AMORTIZATION	2	11
Income Tax Expense (Benefit)	4	12
Equity earnings before income tax:	2	0
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	5	(16)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	18	6
ASSETS	3,731		4,060
EQUITY METHOD AND OTHER INVESTMENTS	1,255		1,271
Segment Reconciling Items [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	0	(1)
INTEREST EXPENSE	109	112
INTEREST INCOME	1	16
DEPRECIATION AND AMORTIZATION	4	4
Income Tax Expense (Benefit)	(48)	(33)
EARNINGS (LOSSES) ATTRIBUTABLE TO COMMON SHARES	(117)	(109)
Discontinued operations	(51)	21
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	0	5
ASSETS	1,135		1,070
Discontinued operations	3,845		3,718
EQUITY METHOD AND OTHER INVESTMENTS	8		11
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(139)	(81)
INTEREST EXPENSE	(23)	(28)
INTEREST INCOME	(24)	(18)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,995)		$ (4,190)
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	17	17
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	28	29
Intersegment eliminations [Member] | Sempra LNG [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 93	$ 34
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%

[1] Derived from audited financial statements.