SEGMENT INFORMATION (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)		Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	7
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 2,962,000,000	$ 3,031,000,000
INTEREST EXPENSE	216,000,000	169,000,000	[1]
INTEREST INCOME	33,000,000	6,000,000	[1]
DEPRECIATION AND AMORTIZATION	386,000,000	360,000,000
INCOME TAX EXPENSE (BENEFIT)	289,000,000	295,000,000	[1]
Equity earnings, before income tax	5,000,000	3,000,000
Equity losses, net of income tax	(25,000,000)	(8,000,000)
Equity losses	(20,000,000)	(5,000,000)	[1]
Earnings (losses)	347,000,000	441,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	1,035,000,000	992,000,000
ASSETS	60,485,000,000			$ 50,454,000,000	[2]
EQUITY METHOD AND OTHER INVESTMENTS	11,766,000,000			2,527,000,000
Operating Segments [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,055,000,000	1,057,000,000
INTEREST EXPENSE	52,000,000	49,000,000
INTEREST INCOME	1,000,000	0
DEPRECIATION AND AMORTIZATION	166,000,000	163,000,000
INCOME TAX EXPENSE (BENEFIT)	56,000,000	90,000,000
Earnings (losses)	170,000,000	155,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	475,000,000	418,000,000
ASSETS	18,017,000,000			17,844,000,000
Operating Segments [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,126,000,000	1,241,000,000
INTEREST EXPENSE	27,000,000	25,000,000
DEPRECIATION AND AMORTIZATION	135,000,000	126,000,000
INCOME TAX EXPENSE (BENEFIT)	59,000,000	98,000,000
Earnings (losses)	225,000,000	203,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	403,000,000	357,000,000
ASSETS	14,462,000,000			14,159,000,000
Operating Segments [Member] | Sempra Texas Utility [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Equity losses, net of income tax	15,000,000	0
Earnings (losses)	15,000,000	0
Segment Reporting Information, Additional Information [Abstract]
ASSETS	9,176,000,000			0
EQUITY METHOD AND OTHER INVESTMENTS	9,176,000,000			0
Operating Segments [Member] | Sempra South American Utilities [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	426,000,000	412,000,000
INTEREST EXPENSE	10,000,000	9,000,000
INTEREST INCOME	6,000,000	5,000,000
DEPRECIATION AND AMORTIZATION	14,000,000	13,000,000
INCOME TAX EXPENSE (BENEFIT)	20,000,000	19,000,000
Equity losses, net of income tax	1,000,000	1,000,000
Earnings (losses)	46,000,000	47,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	56,000,000	43,000,000
ASSETS	4,154,000,000			4,060,000,000
EQUITY METHOD AND OTHER INVESTMENTS	17,000,000			16,000,000
Operating Segments [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	308,000,000	264,000,000
INTEREST EXPENSE	30,000,000	32,000,000
INTEREST INCOME	15,000,000	2,000,000
DEPRECIATION AND AMORTIZATION	43,000,000	36,000,000
INCOME TAX EXPENSE (BENEFIT)	155,000,000	142,000,000
Equity losses, net of income tax	(41,000,000)	(9,000,000)
Earnings (losses)	20,000,000	48,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	59,000,000	94,000,000
ASSETS	8,798,000,000			8,554,000,000
EQUITY METHOD AND OTHER INVESTMENTS	613,000,000			624,000,000
Operating Segments [Member] | Sempra Renewables [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	25,000,000	22,000,000
INTEREST EXPENSE	5,000,000	4,000,000
INTEREST INCOME	2,000,000	1,000,000
DEPRECIATION AND AMORTIZATION	13,000,000	9,000,000
INCOME TAX EXPENSE (BENEFIT)	(7,000,000)	(11,000,000)
Equity earnings, before income tax	5,000,000	2,000,000
Earnings (losses)	21,000,000	11,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	31,000,000	69,000,000
ASSETS	2,764,000,000			2,898,000,000
EQUITY METHOD AND OTHER INVESTMENTS	798,000,000			813,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	104,000,000	132,000,000
INTEREST EXPENSE	8,000,000	11,000,000
INTEREST INCOME	13,000,000	17,000,000
DEPRECIATION AND AMORTIZATION	11,000,000	10,000,000
INCOME TAX EXPENSE (BENEFIT)	12,000,000	1,000,000
Equity earnings, before income tax	0	1,000,000
Earnings (losses)	(16,000,000)	1,000,000
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	6,000,000	3,000,000
ASSETS	4,904,000,000			4,872,000,000
EQUITY METHOD AND OTHER INVESTMENTS	1,085,000,000			997,000,000
Adjustments and eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(1,000,000)	0
All other [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
INTEREST EXPENSE	112,000,000	68,000,000
INTEREST INCOME	14,000,000	0
DEPRECIATION AND AMORTIZATION	4,000,000	3,000,000
INCOME TAX EXPENSE (BENEFIT)	(6,000,000)	(44,000,000)
Earnings (losses)	(134,000,000)	(24,000,000)
Segment Reporting Information, Additional Information [Abstract]
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT	5,000,000	8,000,000
ASSETS	964,000,000			915,000,000
EQUITY METHOD AND OTHER INVESTMENTS	77,000,000			77,000,000
Intersegment eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	(81,000,000)	(97,000,000)
INTEREST EXPENSE	(28,000,000)	(29,000,000)
INTEREST INCOME	(18,000,000)	(19,000,000)
Segment Reporting Information, Additional Information [Abstract]
ASSETS	(2,754,000,000)			$ (2,848,000,000)
Intersegment eliminations [Member] | SDG&E [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	1,000,000	1,000,000
Intersegment eliminations [Member] | SoCalGas [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	17,000,000	18,000,000
Intersegment eliminations [Member] | Sempra Mexico [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	29,000,000	25,000,000
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
REVENUES	$ 34,000,000	$ 53,000,000
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utility [Member]
Segment Reporting Information [Line Items]
Ownership interest	80.25%

[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.