CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
REVENUES
Utilities	$ 2,065		$ 1,609		$ 5,933		$ 5,150
Energy-related businesses	511		507		1,499		1,508
Total revenues	2,576		2,116		7,432		6,658
Utilities [Abstract]
Cost of natural gas	(322)		(305)		(1,367)		(1,489)
Cost of electric fuel and purchased power	(408)		(203)		(976)		(480)
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(252)		(273)		(694)		(801)
Other cost of sales	(68)		(22)		(123)		(67)
Litigation expense	(17)		(17)		(30)		(184)
Other operation and maintenance	(674)		(590)		(1,973)		(1,782)
Depreciation and amortization	(251)		(218)		(730)		(643)
Franchise fees and other taxes	(84)		(76)		(259)		(243)
Utility operating expenses
Equity earnings, before income tax	(12)		(273)		(4)		(266)
Remeasurement of equity method investments					277
Other income (expense), net	12		66		86		82
Interest income	6		5		21		13
Interest expense	(118)		(111)		(344)		(323)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	388		99		1,316		475
Income tax (expense) benefit	(68)		32		(269)		(85)
Equity earnings, net of income tax	6		(4)		45		42
Net income	326	[1]	127	[1]	1,092	[1]	432	[1]
Losses (earnings) attributable to noncontrolling interests	(29)		6		(21)		34
Preferred dividends of subsidiaries	(1)		(2)		(6)		(7)
Earnings	296		131		1,065		459
Basic earnings per common share:
Basic earnings per common share	$ 1.23		$ 0.53		$ 4.44		$ 1.86
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	239,545		246,668		239,693		246,513
Diluted earnings per common share:
Diluted earnings per common share	$ 1.22		$ 0.53		$ 4.40		$ 1.84
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	241,880		249,811		241,955		249,773
Dividends declared per share of common stock	$ 0.48		$ 0.39		$ 1.44		$ 1.17
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	763		718		2,011		1,870
Natural gas	105		93		394		375
Total utility operating revenues	868		811		2,405		2,245
Utility operating expenses
Utility cost of natural gas	40		37		175		170
Utility cost of electric fuel and purchased power	207		203		534		480
Utility operation and maintenance	255		235		756		704
Utility depreciation and amortization	108		96		316		283
Utility franchise fees and other taxes	48		42		138		126
Total utility operating expenses	658		613		1,919		1,763
Utility operating income	210		198		486		482
Other income (expense), net	26		(2)		55		(18)
Interest expense	(37)		(37)		(104)		(99)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	199		159		437		365
Income tax (expense) benefit	(63)		(56)		(154)		(131)
Net income	136		103		283		234
Losses (earnings) attributable to noncontrolling interests	(21)		5		(6)		34
Earnings	115		108		277		268
Preferred dividend requirements	(2)		(2)		(4)		(4)
Earnings attributable to common shares	113		106		273		264
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	844		776		2,776		2,792
Utility operating expenses
Utility cost of natural gas	267		252		1,133		1,244
Utility operation and maintenance	331		285		946		840
Utility depreciation and amortization	83		78		246		230
Utility franchise fees and other taxes	28		27		94		92
Total utility operating expenses	709		642		2,419		2,406
Utility operating income	135		134		357		386
Other income (expense), net	3		2		9		8
Interest income	1		1		1		1
Interest expense	(17)		(17)		(52)		(50)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	122		120		315		345
Income tax (expense) benefit	(41)		(42)		(106)		(132)
Net income	81		78		209		213
Earnings	81		78		209		213
Preferred dividend requirements					(1)		(1)
Earnings attributable to common shares	$ 81		$ 78		$ 208		$ 212

[1] Before preferred dividends of subsidiaries.