ACQUISTION AND DIVESTITURE ACTIVITY - DIVESTITURES (Details) - USD ($) $ in Millions			1 Months Ended			9 Months Ended	12 Months Ended
	Dec. 13, 2018	Sep. 12, 2016	Sep. 30, 2016	May 31, 2016	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 09, 2016	Mar. 29, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill							$ (2,373)	$ (2,397)	$ (2,364)
Current liabilities							25	49
Gain (loss) on deconsolidation	$ 367
Liabilities assumed							145	261	$ 1,322
Equity method investment							$ 9,652	$ 0
Disposal Group Disposed of by Sale [Member] | Certain Subsidiaries Of Sempra Renewables [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale, net of transaction costs	1,585
Cash	(7)
Restricted cash	(7)
Other current assets	(14)
Property, plant and equipment, net	(1,303)
Other investments	(329)
Goodwill	0
Other noncurrent assets	(24)
Current liabilities	8
Long-term debt	70
Asset retirement obligations	52
Other noncurrent liabilities	5
Noncontrolling interests	486
Accumulated other comprehensive income	(9)
Gain on sale of equity interests	513
Proceeds from sale	$ 1,600
Disposal Group Disposed of by Sale [Member] | Energy South [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale, net of transaction costs		$ 304
Cash		(2)
Restricted cash		0
Other current assets		(17)
Property, plant and equipment, net		(199)
Other investments		0
Goodwill		(72)
Other noncurrent assets		(65)
Current liabilities		25
Long-term debt		67
Asset retirement obligations		0
Other noncurrent liabilities		89
Noncontrolling interests		0
Accumulated other comprehensive income		0
Gain on sale of equity interests		130
Sempra LNG & Midstream [Member] | Disposal Group Disposed of by Sale [Member] | Energy South [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash		(2)
Gain on sale of equity interests			$ 130
Proceeds from sale		$ 318
Liabilities assumed			67
Gain on sale of assets, after tax			$ 78
Sempra LNG & Midstream [Member] | Rockies Express [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage in equity method investee				25.00%	25.00%					25.00%	25.00%
Proceeds from sale of investments				$ 443	$ 440
Equity method investment					484
Fair value of investment					440
Other than temporary impairment in investment					44	$ 44
Other than temporary impairment in investment, net of tax					$ 27	$ 27