COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details)		6 Months Ended
	Jul. 28, 2016	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	[1]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value		$ 44,000,000
Insurance receivable for Aliso Canyon costs		679,000,000	$ 325,000,000
Reserve for Aliso Canyon costs		117,000,000	274,000,000
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value		21,000,000
Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value		21,000,000
Insurance receivable for Aliso Canyon costs		679,000,000	325,000,000
Reserve for Aliso Canyon costs		117,000,000	$ 274,000,000
Wildfire [Member] | San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Regulatory Assets Arising From Wildfire Litigation Costs		355,000,000
Potential After-Tax Charge for Nonrecovery of CPUC Regulatory Assets		210,000,000
Portion of Regulatory Assets Arising From Wildfire Litigation Related To CPUC Operations		353,000,000
Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value		717,000,000
Liability Insurance Coverage, Maximum		1,000,000,000
Loss Contingency, Number Of Lawsuits	181
Number Of Lawsuits Filed In Los Angeles County	177
Number Of Lawsuits Filed In San Diego County	2
Number Of Lawsuits Filed In US District Court Of Southern District Of California	2
Civil Penalties Per Day		$ 250,000
Proportion Of Total Gas Storage Capacity, Percentage		63.00%
Net Book Value Of Aliso Canyon Facility		$ 441,000,000
Construction Work In Progress Of New Compressor Station		$ 199,000,000
Estimated Costs Related To Temporary Relocation Percentage		70.00%
Estimated Costs Related To Controlling Well And Stopping Leak And Emissions Percentage		15.00%
Insurance Proceeds		$ 34,000,000
Total Penalties		$ 60,800

[1] Derived from audited financial statements.