ACQUISTION AND DIVESTITURE ACTIVITY - SUMMARY OF DECONSOLIDATIONS (Details) - Sempra LNG & Midstream [Member] - Energy South [Member] - Disposal Group Disposed of by Sale [Member] - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 12, 2016
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)
Other current assets			(17)
Property, plant and equipment, net			(199)
Other noncurrent assets			(137)
Current liabilities			25
Long-term debt			67
Other noncurrent liabilities			$ 89
Gain on sale	$ 130	$ 130