FAIR VALUE MEASUREMENTS 4 (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 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	$ 13,176	[1],[2]	$ 12,347	[1],[2]
Preferred Stock Of Subsidiaries Fair Value Disclosure	20		20
Debt Instrument Unamortized Discount	23		21
Capital Lease Obligations	336		310
Debt Instrument Carrying Amount	322		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	4,849	[1],[3]	4,461	[1],[3]
Debt Instrument Unamortized Discount	12		11
Capital Lease Obligations	232		234
Debt Instrument Carrying Amount	322		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	1,913	[4]	1,913	[4]
Preferred Stock Of Subsidiaries Fair Value Disclosure	22		22
Debt Instrument Unamortized Discount	7		8
Capital Lease Obligations			1
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	14,784	[1],[2]	13,699	[1],[2]
Preferred Stock Of Subsidiaries Fair Value Disclosure	23		23
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	0	[1],[2]	0	[1],[2]
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	13,889	[1],[2]	12,782	[1],[2]
Preferred Stock Of Subsidiaries Fair Value Disclosure	23		23
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial instruments, Total long-term debt	895	[1],[2]	917	[1],[2]
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	5,483	[1],[3]	4,988	[1],[3]
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	0	[1],[3]	0	[1],[3]
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	5,061	[1],[3]	4,563	[1],[3]
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	422	[1],[3]	425	[1],[3]
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	2,167	[4]	2,124	[4]
Preferred Stock Of Subsidiaries Fair Value Disclosure	25		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	0	[4]	0	[4]
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	2,167	[4]	2,124	[4]
Preferred Stock Of Subsidiaries Fair Value Disclosure	25		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	0	[4]	0	[4]
Preferred Stock Of Subsidiaries Fair Value Disclosure	$ 0		$ 0

[1] Level 3 instruments include $322 million and $325 million at March 31, 2015 and December 31, 2014, respectively, related to Otay Mesa VIE.

[2] Before reductions for unamortized discount (net of premium) of $23 million and $21 million at March 31, 2015 and December 31, 2014, respectively, and excluding build-to-suit and capital leases of $336 million and $310 million at March 31, 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.

[3] Before reductions for unamortized discount of $12 million and $11 million at March 31, 2015 and December 31, 2014, respectively, and excluding capital leases of $232 million and $234 million at March 31, 2015 and December 31, 2014, respectively.

[4] Before reductions for unamortized discount of $7 million and $8 million at March 31, 2015 and December 31, 2014, respectively, and excluding capital leases of $1 million at December 31, 2014.