SEGMENT INFORMATION (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)		Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)		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	$ 2,940,000,000	$ 2,679,000,000		$ 8,466,000,000	$ 8,243,000,000
INTEREST EXPENSE	232,000,000	165,000,000	[1]	685,000,000	493,000,000	[1]
INTEREST INCOME	22,000,000	12,000,000	[1]	76,000,000	26,000,000	[1]
DEPRECIATION AND AMORTIZATION	380,000,000	378,000,000		1,158,000,000	1,106,000,000
Income Tax Expense (Benefit)	167,000,000	(84,000,000)	[1]	(127,000,000)	378,000,000	[1]
Equity (losses) earnings, before income tax	(52,000,000)	10,000,000		(236,000,000)	31,000,000
Equity losses, net of income tax	126,000,000	3,000,000		286,000,000	(5,000,000)
Equity earnings	74,000,000	13,000,000	[1]	50,000,000	26,000,000	[1]
Earnings (losses) attributable to common shares	274,000,000	57,000,000	[1]	60,000,000	757,000,000	[1]
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				2,815,000,000	2,880,000,000
ASSETS	60,605,000,000			60,605,000,000				$ 50,454,000,000	[2]
EQUITY METHOD AND OTHER INVESTMENTS	12,114,000,000			12,114,000,000				2,527,000,000
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,299,000,000	1,236,000,000		3,405,000,000	3,351,000,000
INTEREST EXPENSE	56,000,000	53,000,000		161,000,000	151,000,000
INTEREST INCOME	1,000,000	0		3,000,000	0
DEPRECIATION AND AMORTIZATION	174,000,000	170,000,000		509,000,000	499,000,000
Income Tax Expense (Benefit)	53,000,000	(72,000,000)		151,000,000	72,000,000
Earnings (losses) attributable to common shares	205,000,000	(28,000,000)		521,000,000	276,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				1,194,000,000	1,122,000,000
ASSETS	18,512,000,000			18,512,000,000				17,844,000,000
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	802,000,000	684,000,000		2,700,000,000	2,695,000,000
INTEREST EXPENSE	29,000,000	26,000,000		82,000,000	77,000,000
INTEREST INCOME	0	1,000,000		1,000,000	1,000,000
DEPRECIATION AND AMORTIZATION	141,000,000	132,000,000		414,000,000	384,000,000
Income Tax Expense (Benefit)	(7,000,000)	(14,000,000)		75,000,000	103,000,000
Earnings (losses) attributable to common shares	(14,000,000)	7,000,000		244,000,000	268,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				1,127,000,000	1,033,000,000
ASSETS	14,947,000,000			14,947,000,000				14,159,000,000
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity losses, net of income tax	154,000,000	0		283,000,000	0
Earnings (losses) attributable to common shares	154,000,000	0		283,000,000	0
Segment Reporting Information, Additional Information [Abstract]
ASSETS	9,553,000,000			9,553,000,000				0
EQUITY METHOD AND OTHER INVESTMENTS	9,553,000,000			9,553,000,000				0
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	375,000,000	376,000,000		1,190,000,000	1,169,000,000
INTEREST EXPENSE	10,000,000	10,000,000		30,000,000	30,000,000
INTEREST INCOME	6,000,000	6,000,000		19,000,000	17,000,000
DEPRECIATION AND AMORTIZATION	14,000,000	14,000,000		43,000,000	40,000,000
Income Tax Expense (Benefit)	23,000,000	18,000,000		64,000,000	57,000,000
Equity losses, net of income tax	0	1,000,000		1,000,000	2,000,000
Earnings (losses) attributable to common shares	50,000,000	42,000,000		140,000,000	134,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				161,000,000	138,000,000
ASSETS	4,094,000,000			4,094,000,000				4,060,000,000
EQUITY METHOD AND OTHER INVESTMENTS	17,000,000			17,000,000				16,000,000
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	410,000,000	336,000,000		1,028,000,000	873,000,000
INTEREST EXPENSE	30,000,000	21,000,000		90,000,000	73,000,000
INTEREST INCOME	17,000,000	7,000,000		48,000,000	12,000,000
DEPRECIATION AND AMORTIZATION	45,000,000	41,000,000		131,000,000	114,000,000
Income Tax Expense (Benefit)	126,000,000	34,000,000		226,000,000	278,000,000
Equity losses, net of income tax	(28,000,000)	2,000,000		2,000,000	(7,000,000)
Earnings (losses) attributable to common shares	44,000,000	66,000,000		161,000,000	105,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				255,000,000	193,000,000
ASSETS	9,103,000,000			9,103,000,000				8,554,000,000
EQUITY METHOD AND OTHER INVESTMENTS	682,000,000			682,000,000				624,000,000
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	38,000,000	26,000,000		103,000,000	74,000,000
INTEREST EXPENSE	5,000,000	3,000,000		15,000,000	11,000,000
INTEREST INCOME	2,000,000	1,000,000		6,000,000	4,000,000
DEPRECIATION AND AMORTIZATION	0	9,000,000		27,000,000	28,000,000
Income Tax Expense (Benefit)	(2,000,000)	(9,000,000)		(67,000,000)	(25,000,000)
Equity (losses) earnings, before income tax	12,000,000	7,000,000		(170,000,000)	25,000,000
Earnings (losses) attributable to common shares	34,000,000	15,000,000		(54,000,000)	49,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				46,000,000	361,000,000
ASSETS	2,617,000,000			2,617,000,000				2,898,000,000
EQUITY METHOD AND OTHER INVESTMENTS	600,000,000			600,000,000				813,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	147,000,000	152,000,000		330,000,000	406,000,000
INTEREST EXPENSE	3,000,000	9,000,000		18,000,000	29,000,000
INTEREST INCOME	10,000,000	14,000,000		36,000,000	43,000,000
DEPRECIATION AND AMORTIZATION	2,000,000	10,000,000		24,000,000	31,000,000
Income Tax Expense (Benefit)	6,000,000	(2,000,000)		(488,000,000)	17,000,000
Equity (losses) earnings, before income tax	0	3,000,000		1,000,000	6,000,000
Earnings (losses) attributable to common shares	16,000,000	(4,000,000)		(764,000,000)	24,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				19,000,000	16,000,000
ASSETS	3,722,000,000			3,722,000,000				4,872,000,000
EQUITY METHOD AND OTHER INVESTMENTS	1,252,000,000			1,252,000,000				997,000,000
Operating Segments [Member] | All Other Operating Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity (losses) earnings, before income tax	(64,000,000)	0		(67,000,000)	0
Adjustments and eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	0	0		(2,000,000)	0
All other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	122,000,000	74,000,000		371,000,000	209,000,000
INTEREST INCOME	1,000,000	1,000,000		14,000,000	1,000,000
DEPRECIATION AND AMORTIZATION	4,000,000	2,000,000		10,000,000	10,000,000
Income Tax Expense (Benefit)	(32,000,000)	(39,000,000)		(88,000,000)	(124,000,000)
Earnings (losses) attributable to common shares	(215,000,000)	(41,000,000)		(471,000,000)	(99,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				13,000,000	17,000,000
ASSETS	851,000,000			851,000,000				915,000,000
EQUITY METHOD AND OTHER INVESTMENTS	10,000,000			10,000,000				77,000,000
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(131,000,000)	(131,000,000)		(288,000,000)	(325,000,000)
INTEREST EXPENSE	(23,000,000)	(31,000,000)		(82,000,000)	(87,000,000)
INTEREST INCOME	(15,000,000)	(18,000,000)		(51,000,000)	(52,000,000)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,794,000,000)			(2,794,000,000)				$ (2,848,000,000)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,000,000	1,000,000		3,000,000	5,000,000
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	15,000,000	21,000,000		47,000,000	56,000,000
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	31,000,000	27,000,000		88,000,000	78,000,000
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 84,000,000	$ 82,000,000		$ 150,000,000	$ 186,000,000
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.