OTHER FINANCIAL DATA - COMPREHENSIVE INCOME AND EQUITY 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	$ (497)	[1],[2]	$ (228)	[1]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(116)	[1]	(57)	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	0	[1]	12	[1]
Net Other Comprehensive Income	(116)	[1]	(45)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(613)	[1]	(273)	[1]
San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance					(12)	[2]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(12)				(12)	[2]
Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance					(18)	[2]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(18)				(18)	[2]
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	(322)	[1]	(129)	[1]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(62)	[1]	(43)	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	0	[1]	0	[1]
Net Other Comprehensive Income	(62)	[1]	(43)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(384)	[1]	(172)	[1]
Accumulated Defined Benefit Plans Adjustment Net Unamortized Gain Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	(83)	[1]	(73)	[1]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	0	[1]	0	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	1	[1]	3	[1]
Net Other Comprehensive Income	1	[1]	3	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(82)	[1]	(70)	[1]
Accumulated Defined Benefit Plans Adjustment Net Prior Service Cost Credit [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	(2)	[1]	0	[1]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	0	[1]	0	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	0	[1]	0	[1]
Net Other Comprehensive Income	0	[1]	0	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	(2)	[1]	0	[1]
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	(90)	[1]	(26)	[1]
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(54)	[1]	(14)	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	(1)	[1]	9	[1]
Net Other Comprehensive Income	(55)	[1]	(5)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	$ (145)	[1]	$ (31)	[1]

[1] All amounts are net of income tax, if subject to tax, and exclude noncontrolling interests.

[2] Derived from audited financial statements.