COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) £ in Millions	3 Months Ended	36 Months Ended
	Jun. 30, 2015 USD ($)	Mar. 31, 2015	Oct. 01, 2014 GBP (£)
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 62,000,000
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	39,000,000
Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	15,000,000
Loss from Catastrophes [Member] | San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
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
Loss Contingency Number Of Plaintiffs	6,500
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
Payments For Legal Settlements In Excess Of Recovered Amounts	494,000,000
Regulatory Assets Arising From Wildfire Litigation Costs	373,000,000
Potential After-Tax Charge for Nonrecovery of CPUC Regulatory Assets	218,000,000
Portion of Regulatory Assets Arising From Wildfire Litigation Related To CPUC Operations	367,000,000
Mobile Gas Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Number Of Plaintiffs		1,000
Loss Contingency, Number Of Lawsuits		13
Liberty Gas Storage Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Monetary Damages Sought	56,700,000
Counterclaim For Damages On Contract Termination	215,000,000
R B S [Member]
Loss Contingencies [Line Items]
VAT Tax Claim Paid Upon Appeal | £			£ 86
Investment in RBS Sempra Commodities LLP	$ 71,000,000