OTHER FINANCIAL DATA - COMPREHENSIVE INCOME AND EQUITY 2 (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	$ (596,000,000)		$ (273,000,000)	[2]	$ (497,000,000)	[2]	$ (228,000,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(171,000,000)		(102,000,000)		(273,000,000)		(169,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	6,000,000		4,000,000		9,000,000		26,000,000
Net Other Comprehensive Income	[1]	(165,000,000)		(98,000,000)		(264,000,000)		(143,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(761,000,000)		(371,000,000)		(761,000,000)		(371,000,000)
San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance		(12,000,000)	[1]	(8,000,000)	[1]	(12,000,000)	[2]	(9,000,000)	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			1,000,000				2,000,000
Net Other Comprehensive Income	[1]			1,000,000				2,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(12,000,000)		(7,000,000)		(12,000,000)		(7,000,000)
Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance		(18,000,000)	[1]	(18,000,000)	[1]	(18,000,000)	[2]	(18,000,000)	[1]
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			2,000,000				2,000,000
Net Other Comprehensive Income	[1]			2,000,000				2,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(18,000,000)		(16,000,000)		(18,000,000)		(16,000,000)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(427,000,000)		(170,000,000)		(322,000,000)		(129,000,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(92,000,000)		(100,000,000)		(197,000,000)		(141,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	0		0		0		0
Net Other Comprehensive Income	[1]	(92,000,000)		(100,000,000)		(197,000,000)		(141,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(519,000,000)		(270,000,000)		(519,000,000)		(270,000,000)
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	[1]	(81,000,000)		(65,000,000)		(83,000,000)		(73,000,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	0		0		0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	5,000,000		5,000,000		7,000,000		13,000,000
Net Other Comprehensive Income	[1]	5,000,000		5,000,000		7,000,000		13,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(76,000,000)		(60,000,000)		(76,000,000)		(60,000,000)
Accumulated Defined Benefit Plans Adjustment Net Unamortized Gain Loss [Member] | San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(13,000,000)		(9,000,000)		(13,000,000)		(10,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			1,000,000				2,000,000
Net Other Comprehensive Income	[1]			1,000,000				2,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(13,000,000)		(8,000,000)		(13,000,000)		(8,000,000)
Accumulated Defined Benefit Plans Adjustment Net Unamortized Gain Loss [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(5,000,000)		(5,000,000)		(5,000,000)		(5,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			2,000,000				2,000,000
Net Other Comprehensive Income	[1]			2,000,000				2,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(5,000,000)		(3,000,000)		(5,000,000)		(3,000,000)
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	[1]	(2,000,000)		0		(2,000,000)		0
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	0		0		0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	0		0		0		0
Net Other Comprehensive Income	[1]	0		0		0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(2,000,000)		0		(2,000,000)		0
Accumulated Defined Benefit Plans Adjustment Net Prior Service Cost Credit [Member] | San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	1,000,000		1,000,000		1,000,000		1,000,000
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			0				0
Net Other Comprehensive Income	[1]			0				0
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	1,000,000		1,000,000		1,000,000		1,000,000
Accumulated Defined Benefit Plans Adjustment Net Prior Service Cost Credit [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	1,000,000		1,000,000		1,000,000		1,000,000
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			0				0
Net Other Comprehensive Income	[1]			0				0
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	1,000,000		1,000,000		1,000,000		1,000,000
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	[1]	(86,000,000)		(38,000,000)		(90,000,000)		(26,000,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(79,000,000)		(2,000,000)		(76,000,000)		(28,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	1,000,000		(1,000,000)		2,000,000		13,000,000
Net Other Comprehensive Income	[1]	(78,000,000)		(3,000,000)		(74,000,000)		(15,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(164,000,000)		(41,000,000)		(164,000,000)		(41,000,000)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(14,000,000)		(14,000,000)		(14,000,000)		(14,000,000)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]			0				0
Net Other Comprehensive Income	[1]			0				0
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	$ (14,000,000)		$ (14,000,000)		$ (14,000,000)		$ (14,000,000)

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

[2] Derived from audited financial statements.