SEGMENT INFORMATION (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)		Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	6
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 3,031,000,000	$ 2,622,000,000
INTEREST EXPENSE	169,000,000	143,000,000	[1]
INTEREST INCOME	6,000,000	6,000,000	[1]
DEPRECIATION AND AMORTIZATION	360,000,000	328,000,000
INCOME TAX EXPENSE (BENEFIT)	295,000,000	108,000,000	[1]
Equity earnings (losses), before tax	3,000,000	(22,000,000)	[1]
Equity earnings (losses) net of tax	(8,000,000)	17,000,000
Earnings (losses)	441,000,000	353,000,000	[1]
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	992,000,000	971,000,000
ASSETS	48,284,000,000			$ 47,786,000,000	[2]
EQUITY METHOD AND OTHER INVESTMENTS	2,120,000,000			2,097,000,000	[2]
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,057,000,000	991,000,000
INTEREST EXPENSE	49,000,000	48,000,000
DEPRECIATION AND AMORTIZATION	163,000,000	159,000,000
INCOME TAX EXPENSE (BENEFIT)	90,000,000	65,000,000
Earnings (losses)	155,000,000	136,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	418,000,000	329,000,000
ASSETS	17,900,000,000			17,719,000,000
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,241,000,000	1,033,000,000
INTEREST EXPENSE	25,000,000	22,000,000
DEPRECIATION AND AMORTIZATION	126,000,000	122,000,000
INCOME TAX EXPENSE (BENEFIT)	98,000,000	83,000,000
Earnings (losses)	203,000,000	199,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	357,000,000	340,000,000
ASSETS	13,602,000,000			13,424,000,000
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	412,000,000	400,000,000
INTEREST EXPENSE	9,000,000	9,000,000
INTEREST INCOME	5,000,000	5,000,000
DEPRECIATION AND AMORTIZATION	13,000,000	13,000,000
INCOME TAX EXPENSE (BENEFIT)	19,000,000	14,000,000
Equity earnings (losses) net of tax	1,000,000	2,000,000
Earnings (losses)	47,000,000	38,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	43,000,000	43,000,000
ASSETS	3,729,000,000			3,591,000,000
EQUITY METHOD AND OTHER INVESTMENTS	20,000,000			0
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	264,000,000	138,000,000
INTEREST EXPENSE	32,000,000	4,000,000
INTEREST INCOME	2,000,000	2,000,000
DEPRECIATION AND AMORTIZATION	36,000,000	17,000,000
INCOME TAX EXPENSE (BENEFIT)	142,000,000	40,000,000
Equity earnings (losses) net of tax	(9,000,000)	15,000,000
Earnings (losses)	48,000,000	18,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	94,000,000	40,000,000
ASSETS	7,702,000,000			7,542,000,000
EQUITY METHOD AND OTHER INVESTMENTS	212,000,000			180,000,000
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	22,000,000	7,000,000
INTEREST EXPENSE	4,000,000	0
INTEREST INCOME	1,000,000	1,000,000
DEPRECIATION AND AMORTIZATION	9,000,000	1,000,000
INCOME TAX EXPENSE (BENEFIT)	(11,000,000)	(13,000,000)
Equity earnings (losses), before tax	2,000,000	7,000,000
Earnings (losses)	11,000,000	14,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	69,000,000	181,000,000
ASSETS	2,282,000,000			3,644,000,000
EQUITY METHOD AND OTHER INVESTMENTS	812,000,000			844,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	132,000,000	130,000,000
INTEREST EXPENSE	11,000,000	12,000,000
INTEREST INCOME	17,000,000	16,000,000
DEPRECIATION AND AMORTIZATION	10,000,000	13,000,000
INCOME TAX EXPENSE (BENEFIT)	1,000,000	(29,000,000)
Equity earnings (losses), before tax	1,000,000	(29,000,000)
Earnings (losses)	1,000,000	(32,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	3,000,000	35,000,000
ASSETS	5,092,000,000			5,564,000,000
EQUITY METHOD AND OTHER INVESTMENTS	999,000,000			997,000,000
All other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	68,000,000	72,000,000
DEPRECIATION AND AMORTIZATION	3,000,000	3,000,000
INCOME TAX EXPENSE (BENEFIT)	(44,000,000)	(52,000,000)
Earnings (losses)	(24,000,000)	(20,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	8,000,000	3,000,000
ASSETS	644,000,000			475,000,000
EQUITY METHOD AND OTHER INVESTMENTS	77,000,000			76,000,000
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(97,000,000)	(77,000,000)
INTEREST EXPENSE	(29,000,000)	(24,000,000)
INTEREST INCOME	(19,000,000)	(18,000,000)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,667,000,000)			$ (4,173,000,000)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,000,000	3,000,000
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	18,000,000	17,000,000
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	25,000,000	27,000,000
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 53,000,000	$ 30,000,000

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

[2] Derived from audited financial statements.