SEGMENT INFORMATION (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)		Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)		Jun. 25, 2018	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				7
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,564,000,000	$ 2,533,000,000		$ 5,526,000,000	$ 5,564,000,000
INTEREST EXPENSE	237,000,000	159,000,000	[1]	453,000,000	328,000,000	[1]
INTEREST INCOME	21,000,000	8,000,000	[1]	54,000,000	14,000,000	[1]
DEPRECIATION AND AMORTIZATION	392,000,000	368,000,000		778,000,000	728,000,000
Income Tax Expense (Benefit)	(583,000,000)	167,000,000	[1]	(294,000,000)	462,000,000	[1]
Equity (losses) earnings, before income tax	(189,000,000)	18,000,000		(184,000,000)	21,000,000
Equity losses, net of income tax	185,000,000	0		160,000,000	(8,000,000)
Equity (losses) earnings	(4,000,000)	18,000,000	[1]	(24,000,000)	13,000,000	[1]
Earnings (losses)	(561,000,000)	259,000,000		(214,000,000)	700,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				1,941,000,000	1,802,000,000
ASSETS	59,907,000,000			59,907,000,000				$ 50,454,000,000	[2]
EQUITY METHOD AND OTHER INVESTMENTS	11,983,000,000			11,983,000,000				2,527,000,000
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,051,000,000	1,058,000,000		2,106,000,000	2,115,000,000
INTEREST EXPENSE	53,000,000	49,000,000		105,000,000	98,000,000
INTEREST INCOME	1,000,000	0		2,000,000	0
DEPRECIATION AND AMORTIZATION	169,000,000	166,000,000		335,000,000	329,000,000
Income Tax Expense (Benefit)	42,000,000	54,000,000		98,000,000	144,000,000
Earnings (losses)	146,000,000	149,000,000		316,000,000	304,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				851,000,000	763,000,000
ASSETS	18,372,000,000			18,372,000,000				17,844,000,000
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	772,000,000	770,000,000		1,898,000,000	2,011,000,000
INTEREST EXPENSE	26,000,000	26,000,000		53,000,000	51,000,000
INTEREST INCOME	1,000,000	0		1,000,000	0
DEPRECIATION AND AMORTIZATION	138,000,000	126,000,000		273,000,000	252,000,000
Income Tax Expense (Benefit)	23,000,000	19,000,000		82,000,000	117,000,000
Earnings (losses)	33,000,000	58,000,000		258,000,000	261,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				783,000,000	682,000,000
ASSETS	14,734,000,000			14,734,000,000				14,159,000,000
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity losses, net of income tax	114,000,000	0		129,000,000	0
Earnings (losses)	114,000,000	0		129,000,000	0
Segment Reporting Information, Additional Information [Abstract]
ASSETS	9,407,000,000			9,407,000,000				0
EQUITY METHOD AND OTHER INVESTMENTS	9,407,000,000			9,407,000,000				0
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	389,000,000	381,000,000		815,000,000	793,000,000
INTEREST EXPENSE	10,000,000	11,000,000		20,000,000	20,000,000
INTEREST INCOME	7,000,000	6,000,000		13,000,000	11,000,000
DEPRECIATION AND AMORTIZATION	15,000,000	13,000,000		29,000,000	26,000,000
Income Tax Expense (Benefit)	21,000,000	20,000,000		41,000,000	39,000,000
Equity losses, net of income tax	0	0		1,000,000	1,000,000
Earnings (losses)	44,000,000	45,000,000		90,000,000	92,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				107,000,000	77,000,000
ASSETS	4,041,000,000			4,041,000,000				4,060,000,000
EQUITY METHOD AND OTHER INVESTMENTS	16,000,000			16,000,000				16,000,000
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	310,000,000	273,000,000		618,000,000	537,000,000
INTEREST EXPENSE	30,000,000	20,000,000		60,000,000	52,000,000
INTEREST INCOME	16,000,000	3,000,000		31,000,000	5,000,000
DEPRECIATION AND AMORTIZATION	43,000,000	37,000,000		86,000,000	73,000,000
Income Tax Expense (Benefit)	(55,000,000)	102,000,000		100,000,000	244,000,000
Equity losses, net of income tax	71,000,000	0		30,000,000	(9,000,000)
Earnings (losses)	97,000,000	(9,000,000)		117,000,000	39,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				140,000,000	155,000,000
ASSETS	8,935,000,000			8,935,000,000				8,554,000,000
EQUITY METHOD AND OTHER INVESTMENTS	691,000,000			691,000,000				624,000,000
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	40,000,000	26,000,000		65,000,000	48,000,000
INTEREST EXPENSE	5,000,000	4,000,000		10,000,000	8,000,000
INTEREST INCOME	2,000,000	2,000,000		4,000,000	3,000,000
DEPRECIATION AND AMORTIZATION	14,000,000	10,000,000		27,000,000	19,000,000
Income Tax Expense (Benefit)	(58,000,000)	(5,000,000)		(65,000,000)	(16,000,000)
Equity (losses) earnings, before income tax	(187,000,000)	16,000,000		(182,000,000)	18,000,000
Earnings (losses)	(109,000,000)	23,000,000		(88,000,000)	34,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				37,000,000	100,000,000
ASSETS	2,587,000,000			2,587,000,000				2,898,000,000
EQUITY METHOD AND OTHER INVESTMENTS	612,000,000			612,000,000				813,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	79,000,000	122,000,000		183,000,000	254,000,000
INTEREST EXPENSE	7,000,000	9,000,000		15,000,000	20,000,000
INTEREST INCOME	13,000,000	12,000,000		26,000,000	29,000,000
DEPRECIATION AND AMORTIZATION	11,000,000	11,000,000		22,000,000	21,000,000
Income Tax Expense (Benefit)	(506,000,000)	18,000,000		(494,000,000)	19,000,000
Equity (losses) earnings, before income tax	1,000,000	2,000,000		1,000,000	3,000,000
Earnings (losses)	(764,000,000)	27,000,000		(780,000,000)	28,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				13,000,000	12,000,000
ASSETS	3,686,000,000			3,686,000,000				4,872,000,000
EQUITY METHOD AND OTHER INVESTMENTS	1,182,000,000			1,182,000,000				997,000,000
Operating Segments [Member] | All Other Operating Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity (losses) earnings, before income tax	(3,000,000)	0		(3,000,000)	0
Adjustments and eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(1,000,000)	0		(2,000,000)	0
All other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	137,000,000	67,000,000		249,000,000	135,000,000
INTEREST INCOME	(1,000,000)	0		13,000,000	0
DEPRECIATION AND AMORTIZATION	2,000,000	5,000,000		6,000,000	8,000,000
Income Tax Expense (Benefit)	(50,000,000)	(41,000,000)		(56,000,000)	(85,000,000)
Earnings (losses)	(122,000,000)	(34,000,000)		(256,000,000)	(58,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				10,000,000	13,000,000
ASSETS	869,000,000			869,000,000				915,000,000
EQUITY METHOD AND OTHER INVESTMENTS	75,000,000			75,000,000				77,000,000
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(76,000,000)	(97,000,000)		(157,000,000)	(194,000,000)
INTEREST EXPENSE	(31,000,000)	(27,000,000)		(59,000,000)	(56,000,000)
INTEREST INCOME	(18,000,000)	(15,000,000)		(36,000,000)	(34,000,000)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,724,000,000)			(2,724,000,000)				$ (2,848,000,000)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,000,000	3,000,000		2,000,000	4,000,000
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	15,000,000	17,000,000		32,000,000	35,000,000
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	28,000,000	26,000,000		57,000,000	51,000,000
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 32,000,000	$ 51,000,000		$ 66,000,000	$ 104,000,000
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%			80.25%
Disposal Group Held-for-sale [Member] | Non-utility natural gas storage assets [Member] | Bay Gas [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.

[2] Derived from audited financial statements.