FAIR VALUE MEASUREMENTS 4 (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[1],[2]	$ 13,341	$ 12,347
Preferred Stock Of Subsidiaries Fair Value Disclosure		20	20
Debt Instrument Unamortized Discount		21	21
Capital Lease Obligations		375	310
Debt Instrument Carrying Amount		317	325
Carrying Amount | San Diego Gas and Electric Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[2],[3]	4,557	4,461
Debt Instrument Unamortized Discount		10	11
Capital Lease Obligations		231	234
Debt Instrument Carrying Amount		317	325
Carrying Amount | Southern California Gas Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[4]	2,512	1,913
Preferred Stock Of Subsidiaries Fair Value Disclosure		22	22
Debt Instrument Unamortized Discount		7	8
Capital Lease Obligations		2	1
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[1],[2]	14,396	13,699
Preferred Stock Of Subsidiaries Fair Value Disclosure		22	23
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[1],[2]	0	0
Preferred Stock Of Subsidiaries Fair Value Disclosure		0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[1],[2]	13,693	12,782
Preferred Stock Of Subsidiaries Fair Value Disclosure		22	23
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[1],[2]	703	917
Preferred Stock Of Subsidiaries Fair Value Disclosure		0	0
Fair Value | San Diego Gas and Electric Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[2],[3]	4,969	4,988
Fair Value | San Diego Gas and Electric Company [Member] | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[2],[3]	0	0
Fair Value | San Diego Gas and Electric Company [Member] | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[2],[3]	4,652	4,563
Fair Value | San Diego Gas and Electric Company [Member] | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[2],[3]	317	425
Fair Value | Southern California Gas Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[4]	2,658	2,124
Preferred Stock Of Subsidiaries Fair Value Disclosure		24	25
Fair Value | Southern California Gas Company [Member] | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[4]	0	0
Preferred Stock Of Subsidiaries Fair Value Disclosure		0	0
Fair Value | Southern California Gas Company [Member] | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[4]	2,658	2,124
Preferred Stock Of Subsidiaries Fair Value Disclosure		24	25
Fair Value | Southern California Gas Company [Member] | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	[4]	0	0
Preferred Stock Of Subsidiaries Fair Value Disclosure		$ 0	$ 0

[1] Before reductions for unamortized discount (net of premium) of $21 million at both September 30, 2015 and December 31, 2014, and excluding build-to-suit and capital lease obligations of $375 million and $310 million at September 30, 2015 and December 31, 2014, respectively. We discuss our long-term debt in Note 6 above and in Note 5 of the Notes to Consolidated Financial Statements in the Annual Report.

[2] Level 3 instruments include $317 million and $325 million at September 30, 2015 and December 31, 2014, respectively, related to Otay Mesa VIE.

[3] Before reductions for unamortized discount of $10 million and $11 million at September 30, 2015 and December 31, 2014, respectively, and excluding capital lease obligations of $231 million and $234 million at September 30, 2015 and December 31, 2014, respectively.

[4] Before reductions for unamortized discount of $7 million and $8 million at September 30, 2015 and December 31, 2014, respectively, and excluding capital lease obligations of $2 million and $1 million at September 30, 2015 and December 31, 2014, respectively.