COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) £ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($)	Oct. 01, 2015 GBP (£)	Oct. 01, 2014 GBP (£)
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 52,000,000
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	27,000,000
Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	13,000,000
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
Number Of Remaining Cases Set for Trial	1
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	496,000,000
Regulatory Assets Arising From Wildfire Litigation Costs	362,000,000
Potential After-Tax Charge for Nonrecovery of CPUC Regulatory Assets	213,000,000
Portion of Regulatory Assets Arising From Wildfire Litigation Related To CPUC Operations	$ 359,000,000
Number of Appeals Pending	2
Mobile Gas Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Number Of Plaintiffs	1,000
Loss Contingency, Number Of Lawsuits	13
R B S [Member]
Loss Contingencies [Line Items]
VAT Tax Claim Paid Upon Appeal | £		£ 156	£ 86
Investment in RBS Sempra Commodities LLP	$ 71,000,000
Rim Rock [Member] | San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Estimated Tax Equity Investment	$ 285,000,000
So Cal Gas PCB Litigation Member [Member] | Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Number of Lawsuits as a Defendant	7
Number of Lawsuits Settled	5
Mobile Gas Litigation [Member] [Member]
Loss Contingencies [Line Items]
Number of Lawsuits Settled	6
Number Of Lawsuits Remaining	7
Number Of Plaintiffs Scheduled For Trial	10