SEGMENT INFORMATION (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)		Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)		Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				6
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,533,000,000	$ 2,156,000,000		$ 5,564,000,000	$ 4,778,000,000
INTEREST EXPENSE	159,000,000	142,000,000	[1]	328,000,000	285,000,000	[1]
INTEREST INCOME	8,000,000	6,000,000	[1]	14,000,000	12,000,000	[1]
DEPRECIATION AND AMORTIZATION	368,000,000	314,000,000		728,000,000	642,000,000
INCOME TAX EXPENSE (BENEFIT)	167,000,000	(106,000,000)	[1]	462,000,000	2,000,000	[1]
Equity earnings (losses), before tax	18,000,000	14,000,000	[1]	21,000,000	(8,000,000)	[1]
Equity earnings (losses) net of tax	0	33,000,000		(8,000,000)	50,000,000
Earnings (losses)	259,000,000	16,000,000	[1]	700,000,000	369,000,000	[1]
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				1,802,000,000	2,006,000,000
ASSETS	49,376,000,000			49,376,000,000			$ 47,786,000,000	[2]
EQUITY METHOD AND OTHER INVESTMENTS	2,134,000,000			2,134,000,000			2,097,000,000	[2]
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,058,000,000	992,000,000		2,115,000,000	1,983,000,000
INTEREST EXPENSE	49,000,000	48,000,000		98,000,000	96,000,000
DEPRECIATION AND AMORTIZATION	166,000,000	158,000,000		329,000,000	317,000,000
INCOME TAX EXPENSE (BENEFIT)	54,000,000	48,000,000		144,000,000	113,000,000
Earnings (losses)	149,000,000	100,000,000		304,000,000	236,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				763,000,000	602,000,000
ASSETS	18,708,000,000			18,708,000,000			17,719,000,000
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	770,000,000	617,000,000		2,011,000,000	1,650,000,000
INTEREST EXPENSE	26,000,000	24,000,000		51,000,000	46,000,000
DEPRECIATION AND AMORTIZATION	126,000,000	112,000,000		252,000,000	234,000,000
INCOME TAX EXPENSE (BENEFIT)	19,000,000	(29,000,000)		117,000,000	54,000,000
Earnings (losses)	58,000,000	(1,000,000)		261,000,000	198,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				682,000,000	650,000,000
ASSETS	13,743,000,000			13,743,000,000			13,424,000,000
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	381,000,000	385,000,000		793,000,000	785,000,000
INTEREST EXPENSE	11,000,000	11,000,000		20,000,000	20,000,000
INTEREST INCOME	6,000,000	5,000,000		11,000,000	10,000,000
DEPRECIATION AND AMORTIZATION	13,000,000	14,000,000		26,000,000	27,000,000
INCOME TAX EXPENSE (BENEFIT)	20,000,000	15,000,000		39,000,000	29,000,000
Equity earnings (losses) net of tax	0	0		1,000,000	2,000,000
Earnings (losses)	45,000,000	43,000,000		92,000,000	81,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				77,000,000	82,000,000
ASSETS	3,750,000,000			3,750,000,000			3,591,000,000
EQUITY METHOD AND OTHER INVESTMENTS	20,000,000			20,000,000			0
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	273,000,000	147,000,000		537,000,000	285,000,000
INTEREST EXPENSE	20,000,000	4,000,000		52,000,000	8,000,000
INTEREST INCOME	3,000,000	1,000,000		5,000,000	3,000,000
DEPRECIATION AND AMORTIZATION	37,000,000	15,000,000		73,000,000	32,000,000
INCOME TAX EXPENSE (BENEFIT)	102,000,000	(12,000,000)		244,000,000	28,000,000
Equity earnings (losses) net of tax	0	33,000,000		(9,000,000)	48,000,000
Earnings (losses)	(9,000,000)	57,000,000		39,000,000	75,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				155,000,000	140,000,000
ASSETS	7,835,000,000			7,835,000,000			7,542,000,000
EQUITY METHOD AND OTHER INVESTMENTS	234,000,000			234,000,000			180,000,000
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	26,000,000	6,000,000		48,000,000	13,000,000
INTEREST EXPENSE	4,000,000	0		8,000,000	0
INTEREST INCOME	2,000,000	0		3,000,000	1,000,000
DEPRECIATION AND AMORTIZATION	10,000,000	2,000,000		19,000,000	3,000,000
INCOME TAX EXPENSE (BENEFIT)	(5,000,000)	(9,000,000)		(16,000,000)	(22,000,000)
Equity earnings (losses), before tax	16,000,000	11,000,000		18,000,000	18,000,000
Earnings (losses)	23,000,000	12,000,000		34,000,000	26,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				100,000,000	457,000,000
ASSETS	2,349,000,000			2,349,000,000			3,644,000,000
EQUITY METHOD AND OTHER INVESTMENTS	825,000,000			825,000,000			844,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	122,000,000	90,000,000		254,000,000	220,000,000
INTEREST EXPENSE	9,000,000	10,000,000		20,000,000	22,000,000
INTEREST INCOME	12,000,000	17,000,000		29,000,000	33,000,000
DEPRECIATION AND AMORTIZATION	11,000,000	12,000,000		21,000,000	25,000,000
INCOME TAX EXPENSE (BENEFIT)	18,000,000	(99,000,000)		19,000,000	(128,000,000)
Equity earnings (losses), before tax	2,000,000	3,000,000		3,000,000	(26,000,000)
Earnings (losses)	27,000,000	(149,000,000)		28,000,000	(181,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				12,000,000	68,000,000
ASSETS	4,861,000,000			4,861,000,000			5,564,000,000
EQUITY METHOD AND OTHER INVESTMENTS	977,000,000			977,000,000			997,000,000
All other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	67,000,000	74,000,000		135,000,000	146,000,000
DEPRECIATION AND AMORTIZATION	5,000,000	1,000,000		8,000,000	4,000,000
INCOME TAX EXPENSE (BENEFIT)	(41,000,000)	(20,000,000)		(85,000,000)	(72,000,000)
Earnings (losses)	(34,000,000)	(46,000,000)		(58,000,000)	(66,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT				13,000,000	7,000,000
ASSETS	660,000,000			660,000,000			475,000,000
EQUITY METHOD AND OTHER INVESTMENTS	78,000,000			78,000,000			76,000,000
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(97,000,000)	(81,000,000)		(194,000,000)	(158,000,000)
INTEREST EXPENSE	(27,000,000)	(29,000,000)		(56,000,000)	(53,000,000)
INTEREST INCOME	(15,000,000)	(17,000,000)		(34,000,000)	(35,000,000)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,530,000,000)			(2,530,000,000)			$ (4,173,000,000)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	3,000,000			4,000,000	3,000,000
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	17,000,000	18,000,000		35,000,000	35,000,000
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	26,000,000	27,000,000		51,000,000	54,000,000
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 51,000,000	$ 36,000,000		$ 104,000,000	$ 66,000,000

[1] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.

[2] Derived from audited financial statements.