CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
REVENUES
Utilities	$ 1,838	$ 1,922	[1]	$ 3,929	$ 3,868	[1]
Energy-related businesses	251	500	[1]	543	988	[1]
Total revenues	2,089	2,422	[1]	4,472	4,856	[1]
Utilities [Abstract]
Cost of natural gas	(221)	(403)	[1]	(652)	(1,045)	[1]
Cost of electric fuel and purchased power	(349)	(397)	[1]	(737)	(568)	[1]
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(81)	(212)	[1]	(210)	(442)	[1]
Other cost of sales	(41)	(32)	[1]	(74)	(55)	[1]
Operation and maintenance	(720)	(673)	[1]	(1,391)	(1,312)	[1]
Depreciation and amortization	(266)	(248)	[1]	(523)	(478)	[1]
Franchise fees and other taxes	(79)	(80)	[1]	(175)	(175)	[1]
Equity (losses) earnings before income tax
Equity (losses) earnings before income tax, Rockies Express	(290)	10	[1]	(279)	19	[1]
Equity (losses) earnings before income tax, other	(3)	(3)	[1]	(2)	(11)	[1]
Remeasurement of equity method investments		277	[1]		277	[1]
Other income (expense), net	18	31	[1]	93	74	[1]
Interest income	4	12	[1]	9	15	[1]
Interest expense	(113)	(118)	[1]	(226)	(226)	[1]
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	(52)	586	[1]	305	929	[1]
Income tax (expense) benefit	118	(100)	[1]	1	(214)	[1]
Equity earnings, net of income tax	8	8	[1]	19	39	[1]
Net income	74	494	[1]	325	754	[1]
Losses (earnings) attributable to noncontrolling interests	(11)	12	[1]	(24)	8	[1]
Preferred dividends of subsidiaries	(1)	(3)	[1]	(3)	(5)	[1]
Earnings	62	503	[1]	298	757	[1]
Basic earnings per common share:
Basic earnings per common share	$ 0.26	$ 2.10	[1]	$ 1.24	$ 3.16	[1]
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	241,141	239,415	[1]	240,853	239,769	[1]
Diluted earnings per common share:
Diluted earnings per common share	$ 0.25	$ 2.09	[1]	$ 1.21	$ 3.14	[1]
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	246,260	240,761	[1]	245,766	241,154	[1]
Dividends declared per share of common stock	$ 0.60	$ 0.48	[1]	$ 1.20	$ 0.96	[1]
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	680	583		1,351	1,248
Natural gas	100	114		263	289
Total utility operating revenues	780	697		1,614	1,537
Utility operating expenses
Utility cost of natural gas	34	52		101	135
Utility cost of electric fuel and purchased power	140	156		303	327
Utility operation and maintenance	275	228		543	501
Utility depreciation and amortization	119	105		231	208
Utility franchise fees and other taxes	43	43		89	90
Total utility operating expenses	611	584		1,267	1,261
Utility operating income	169	113		347	276
Equity (losses) earnings before income tax
Other income (expense), net	24	13		54	29
Interest expense	(39)	(31)		(75)	(67)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	154	95		326	238
Income tax (expense) benefit	(53)	(42)		(113)	(91)
Net income	101	53		213	147
Losses (earnings) attributable to noncontrolling interests	(5)	19		(11)	15
Earnings	96	72		202	162
Preferred dividend requirements	(1)	(1)		(2)	(2)
Earnings attributable to common shares	95	71		200	160
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	720	876		1,600	1,932
Utility operating expenses
Utility cost of natural gas	179	335		528	866
Utility operation and maintenance	328	327		617	615
Utility depreciation and amortization	90	82		177	163
Utility franchise fees and other taxes	28	29		64	66
Total utility operating expenses	625	773		1,386	1,710
Utility operating income	95	103		214	222
Equity (losses) earnings before income tax
Other income (expense), net	4	3		8	6
Interest expense	(17)	(18)		(34)	(35)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	82	88		188	193
Income tax (expense) benefit	(28)	(28)		(68)	(65)
Net income	54	60		120	128
Earnings	54	60		120	128
Preferred dividend requirements	(1)	(1)		(1)	(1)
Earnings attributable to common shares	$ 53	$ 59		$ 119	$ 127

[1] As adjusted for the retrospective effect of a change in accounting principle as we discuss in Note 1.