COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details)				3 Months Ended	36 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2015 San Diego Gas and Electric Company [Member] USD ($)	Mar. 31, 2015 Southern California Gas Company [Member] USD ($)	Mar. 31, 2015 Loss from Catastrophes [Member] San Diego Gas and Electric Company [Member] USD ($)	Mar. 31, 2015 Mobile Gas Litigation [Member]	Mar. 31, 2015 Liberty Gas Storage Litigation [Member] USD ($)	Mar. 31, 2015 R B S [Member] USD ($)	Oct. 01, 2014 R B S [Member] GBP (£)	Mar. 31, 2015 Rim Rock [Member] San Diego Gas and Electric Company [Member] USD ($)
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 57,000,000	$ 39,000,000	$ 12,000,000
Payments for Legal Settlements in April 2010, CPUC Proceedings				14,750,000
Claims Payments By Insurers To All Claimants				1,600,000,000
Percentage of Total Claims to be Paid by Company				57.50%
Total Settled Claims				1,300,000,000
Total Remaining Settlement Demands				60,000,000
Loss Contingency Number Of Plaintiffs				6,500	350
Loss Contingency, Number Of Claims				19,000
Liability Insurance Coverage, Maximum				1,100,000,000
Litigation Settlement Amount, Gross, Recovered From Third Parties				824,000,000
Loss Contingency Monetary Damages Sought						56,700,000
Counterclaim For Damages On Contract Termination						215,000,000
Payments For Legal Settlements In Excess Of Recovered Amounts				493,000,000
Regulatory Assets Arising From Wildfire Litigation Costs				372,000,000
Potential After-Tax Charge for Nonrecovery of CPUC Regulatory Assets				217,000,000
Portion of Regulatory Assets Arising From Wildfire Litigation Related To CPUC Operations				367,000,000
Estimated Tax Equity Investment									285,000,000
VAT Tax Claim Paid Upon Appeal								86,000,000
Investment in RBS Sempra Commodities LLP							$ 71,000,000
Loss Contingency, Number Of Lawsuits					11