SEGMENT INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010		Dec. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	$ 2,422		$ 2,008		$ 4,856		$ 4,542
Segment reporting information, Percentage of Total Consolidated Revenues	100.00%		100.00%		100.00%		100.00%
Segment reporting information, Interest Expense	118		103		226		212
Segment reporting information, Interest Income	12		4		15		8
Segment reporting information, Depreciation and Amortization	248		215		479		425
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	100.00%		100.00%		100.00%		100.00%
Segment reporting information, Income Tax Expense (Benefit)	92		59		201		117
Segment reporting information, Equity Earnings (Losses) Recorded Before Tax	7		(8)		8		7
Segment reporting information, Earnings (Losses)	511		222		769		328
Segment reporting information, Percentage of Consolidated Earnings (Losses)	100.00%		100.00%		100.00%		100.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					1,225		839
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					100.00%		100.00%
Segment reporting information, Assets	31,836				31,836				30,283
Segment reporting information, Percentage of Consolidated Assets	100.00%				100.00%				100.00%
Segment reporting information, Investment in Equity Method Investees	1,743				1,743				2,765
S D G E Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	697		692		1,537		1,434
Segment reporting information, Percentage of Total Consolidated Revenues	29.00%		34.00%		32.00%		32.00%
Segment reporting information, Interest Expense	31		31		67		62
Segment reporting information, Depreciation and Amortization	105		95		208		187
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	42.00%		44.00%		43.00%		44.00%
Segment reporting information, Income Tax Expense (Benefit)	42		44		91		75
Segment reporting information, Earnings (Losses)	71	[1]	75	[1]	160	[1]	158	[1]
Segment reporting information, Percentage of Consolidated Earnings (Losses)	14.00%		34.00%		21.00%		48.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					714		522
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					58.00%		62.00%
Segment reporting information, Assets	12,366				12,366				12,077
Segment reporting information, Percentage of Consolidated Assets	39.00%				39.00%				40.00%
Segment Reporting Information, Intersegment Revenue	1		2		3		3
So Cal Gas Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	876		834		1,932		2,016
Segment reporting information, Percentage of Total Consolidated Revenues	36.00%		42.00%		40.00%		44.00%
Segment reporting information, Interest Expense	18		16		35		33
Segment reporting information, Depreciation and Amortization	82		77		163		152
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	33.00%		36.00%		34.00%		36.00%
Segment reporting information, Income Tax Expense (Benefit)	28		34		65		90
Segment reporting information, Earnings (Losses)	59	[1]	69	[1]	127	[1]	134	[1]
Segment reporting information, Percentage of Consolidated Earnings (Losses)	12.00%		31.00%		16.00%		41.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					325		216
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					27.00%		26.00%
Segment reporting information, Assets	7,740				7,740				7,986
Segment reporting information, Percentage of Consolidated Assets	24.00%				24.00%				26.00%
Segment Reporting Information, Intersegment Revenue	12		10		25		21
Sempra Generation Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	268		268		537		586
Segment reporting information, Percentage of Total Consolidated Revenues	11.00%		13.00%		11.00%		13.00%
Segment reporting information, Interest Expense	4		3		6		7
Segment reporting information, Interest Income	1		3		6		5
Segment reporting information, Depreciation and Amortization	18		16		37		31
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	7.00%		7.00%		8.00%		7.00%
Segment reporting information, Income Tax Expense (Benefit)	12		6		34		(32)
Segment reporting information, Equity Earnings (Losses) Recorded Before Tax	(1)		(1)				(1)
Segment reporting information, Earnings (Losses)	50		52		94		1
Segment reporting information, Percentage of Consolidated Earnings (Losses)	10.00%		23.00%		12.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					76
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					6.00%		1.00%
Segment reporting information, Assets	2,021				2,021				2,401
Segment reporting information, Percentage of Consolidated Assets	6.00%				6.00%				8.00%
Segment reporting information, Investment in Equity Method Investees	177				177				185
Sempra Pipelines and Storage Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	445		75		554		185
Segment reporting information, Percentage of Total Consolidated Revenues	18.00%		4.00%		11.00%		4.00%
Segment reporting information, Interest Expense	27		6		35		15
Segment reporting information, Interest Income	15		4		17		8
Segment reporting information, Depreciation and Amortization	26		10		39		21
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	11.00%		5.00%		8.00%		5.00%
Segment reporting information, Income Tax Expense (Benefit)	22		7		29		13
Segment reporting information, Equity Earnings (Losses) Recorded Before Tax	10		12		19		22
Segment reporting information, Equity Earnings (Losses) Recorded Net of Tax	8		27		39		46
Segment reporting information, Earnings (Losses)	337		39		391		77
Segment reporting information, Percentage of Consolidated Earnings (Losses)	66.00%		17.00%		51.00%		24.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					103		90
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					8.00%		11.00%
Segment reporting information, Assets	7,252				7,252				5,175
Segment reporting information, Percentage of Consolidated Assets	23.00%				23.00%				17.00%
Segment reporting information, Investment in Equity Method Investees	1,113	[2]			1,113	[2]			1,777	[2]
Segment Reporting Information, Intersegment Revenue	11		13		22		27
Sempra L N G Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	159		166		345		371
Segment reporting information, Percentage of Total Consolidated Revenues	7.00%		8.00%		7.00%		8.00%
Segment reporting information, Interest Expense	11		12		22		24
Segment reporting information, Interest Income	1				2
Segment reporting information, Depreciation and Amortization	12		13		25		25
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	5.00%		6.00%		5.00%		6.00%
Segment reporting information, Income Tax Expense (Benefit)	12		4		23		16
Segment reporting information, Earnings (Losses)	18		13		51		45
Segment reporting information, Percentage of Consolidated Earnings (Losses)	3.00%		6.00%		7.00%		14.00%
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					6		4
Segment reporting information, Percentage of Consolidated Expenditures for Property, Plant & Equipment					1.00%
Segment reporting information, Assets	2,432				2,432				2,379
Segment reporting information, Percentage of Consolidated Assets	8.00%				8.00%				8.00%
All Other Segments [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Interest Expense	60	[3]	61	[3]	117	[3]	122	[3]
Segment reporting information, Interest Income					1	[3]
Segment reporting information, Depreciation and Amortization	5		4		7		9
Segment reporting information, Percentage of Consolidated Depreciation and Amortization	2.00%		2.00%		2.00%		2.00%
Segment reporting information, Income Tax Expense (Benefit)	(24)		(36)		(41)		(45)
Segment reporting information, Equity Earnings (Losses) Recorded Before Tax	(2)		(19)		(11)		(14)
Segment reporting information, Earnings (Losses)	(24)		(26)		(54)		(87)
Segment reporting information, Percentage of Consolidated Earnings (Losses)	(5.00%)		(11.00%)		(7.00%)		(27.00%)
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Expenditures for Property, Plant & Equipment					1		2
Segment reporting information, Assets	932				932				1,691
Segment reporting information, Percentage of Consolidated Assets	3.00%				3.00%				6.00%
Segment reporting information, Investment in Equity Method Investees	453				453				803
Adjustments and Eliminations [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	1		(2)		1		1
Intercompany Eliminations Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Interest Expense	(33)	[3]	(26)	[3]	(56)	[3]	(51)	[3]
Segment reporting information, Interest Income	(5)	[3]	(3)	[3]	(11)	[3]	(5)	[3]
Intersegment Revenues Segment [Member]
Segment Reporting Information, Profit (Loss) [Abstract]
Segment reporting information, Revenues	(24)	[4]	(25)	[4]	(50)	[4]	(51)	[4]
Segment reporting information, Percentage of Total Consolidated Revenues	(1.00%)		(1.00%)		(1.00%)		(1.00%)
Intersegment Receivables Segment [Member]
Segment Reporting Information, Additional Information [Abstract]
Segment reporting information, Assets	$ (907)				$ (907)				$ (1,426)
Segment reporting information, Percentage of Consolidated Assets	(3.00%)				(3.00%)				(5.00%)

[1] After preferred dividends.

[2] We provide additional information regarding Sempra Pipelines & Storage's investments in Note 3.

[3] Prior year amounts have been revised to present amounts after eliminations between Parent and corporate entities.

[4] Revenues for reportable segments include intersegment revenues of: $1 million, $12 million and $11 million for SDG&E, SoCalGas and Sempra Pipelines & Storage, respectively, for the three months ended June 30, 2011. $3 million, $25 million and $22 million for SDG&E, SoCalGas and Sempra Pipelines & Storage, respectively, for the six months ended June 30, 2011. $2 million, $10 million and $13 million for SDG&E, SoCalGas and Sempra Pipelines & Storage, respectively, for the three months ended June 30, 2010. $3 million, $21 million and $27 million for SDG&E, SoCalGas and Sempra Pipelines & Storage, respectively, for the six months ended June 30, 2010.