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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 2,877	$ 2,553
Accretion expense	121	109
Liabilities incurred	7	34
Deconsolidation and reclassification	(61)	0
Payments	(42)	(63)
Revisions	71	244
Ending Balance	2,973	2,877
San Diego Gas and Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	839	830
Accretion expense	39	39
Liabilities incurred	0	17
Deconsolidation and reclassification	0	0
Payments	(39)	(61)
Revisions	35	14
Ending Balance	874	839
Southern California Gas Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	1,953	1,659
Accretion expense	78	66
Liabilities incurred	0	0
Deconsolidation and reclassification	0	0
Payments	(3)	(2)
Revisions	35	230
Ending Balance	2,063	$ 1,953
Termoelectrica de Mexicali [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Reclassified from held for sale	5
Sempra Renewables [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Reclassified to held for sale	6
Sempra LNG & Midstream [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Reclassified to held for sale	8
Sempra Renewables [Member] | Disposal Group Disposed of by Sale [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Deconsolidation and reclassification	$ 52

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Publisher FASB
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-SubTopic 20
-Section 50
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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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