ACQUISITION AND DIVESTITURE ACTIVITY - PRO FORMA INFORMATION (Details) - GdC [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 2,608	$ 2,545	$ 7,529	$ 7,708
Net income	308	308	744	1,550
Earnings	$ 299	$ 255	$ 685	$ 1,280
Sempra Mexico [Member]
Business Acquisition, Pro Forma Information [Abstract]
Noncontrolling interest ownership	18.90%		18.90%
Pro Forma [Member] \| Sempra Mexico [Member]
Business Acquisition, Pro Forma Information [Abstract]
Noncontrolling interest ownership	33.60%		33.60%

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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