OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	$ (806)	[2]	$ (497)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(14)		(116)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	(1)		0
Net Other Comprehensive Income	[1]	(15)		(116)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(821)		(613)
San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[2]	(8)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance		(8)
Southern California Gas Company [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[2]	(19)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance		(19)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(582)		(322)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	68		(62)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	0		0
Net Other Comprehensive Income	[1]	68		(62)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(514)		(384)
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]	(137)		(90)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(82)		(54)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	(2)		(1)
Net Other Comprehensive Income	[1]	(84)		(55)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(221)		(145)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(87)		(85)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	1		1
Net Other Comprehensive Income	[1]	1		1
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	$ (86)		$ (84)

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

[2] Derived from audited financial statements.