OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	$ (821)	$ (613)	[2]	$ (806)	[2]	$ (497)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(37)	14		(51)		(102)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	6	3		5		3
Net Other Comprehensive Income	[1]	(31)	17		(46)		(99)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(852)	(596)	[2]	(852)		(596)	[2]
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)
Amounts Reclassified From Accumulated Other Comprehensive Income		0	0		0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(8)			(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	[1]	(19)			(19)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(514)	(384)		(582)		(322)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	11	(43)		79		(105)
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	0	0		0		0
Net Other Comprehensive Income	[1]	11	(43)		79		(105)
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(503)	(427)		(503)		(427)
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]	(221)	(145)		(137)		(90)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	(48)	57		(130)		3
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	5	2		3		1
Net Other Comprehensive Income	[1]	(43)	59		(127)		4
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	(264)	(86)		(264)		(86)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, beginning balance	[1]	(86)	(84)		(87)		(85)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	[1]	0	0		0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	[1]	1	1		2		2
Net Other Comprehensive Income	[1]	1	1		2		2
Accumulated Other Comprehensive Income (Loss), Net of Tax, ending balance	[1]	$ (85)	$ (83)		$ (85)		$ (83)

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

[2] Derived from audited financial statements.