CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
REVENUES
Utilities	$ 2,170	$ 2,065	[1]	$ 6,099	$ 5,933	[1]
Energy-related businesses	337	511	[1]	880	1,499	[1]
Total revenues	2,507	2,576	[1]	6,979	7,432	[1]
Utilities [Abstract]
Cost of natural gas	(212)	(322)	[1]	(864)	(1,367)	[1]
Cost of electric fuel and purchased power	(515)	(408)	[1]	(1,252)	(976)	[1]
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(136)	(252)	[1]	(346)	(694)	[1]
Other cost of sales	(43)	(68)	[1]	(117)	(123)	[1]
Operation and maintenance	(732)	(691)	[1]	(2,123)	(2,003)	[1]
Depreciation and amortization	(280)	(251)	[1]	(803)	(729)	[1]
Franchise fees and other taxes	(89)	(84)	[1]	(264)	(259)	[1]
Equity (losses) earnings before income tax
Equity (losses) earnings before income tax, Rockies Express	(87)	10	[1]	(366)	29	[1]
Equity (losses) earnings before income tax, other	(7)	(22)	[1]	(9)	(33)	[1]
Remeasurement of equity method investments					277	[1]
Other income (expense), net	44	12	[1]	137	86	[1]
Interest income	5	6	[1]	14	21	[1]
Interest expense	(126)	(118)	[1]	(352)	(344)	[1]
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	329	388	[1]	634	1,317	[1]
Income tax (expense) benefit	(49)	(75)	[1]	(48)	(289)	[1]
Equity earnings, net of income tax	10	6	[1]	29	45	[1]
Net income	290	319	[1]	615	1,073	[1]
Losses (earnings) attributable to noncontrolling interests	(20)	(29)	[1]	(44)	(21)	[1]
Preferred dividends of subsidiaries	(2)	(1)	[1]	(5)	(6)	[1]
Earnings	268	289	[1]	566	1,046	[1]
Basic earnings per common share:
Basic earnings per common share	$ 1.11	$ 1.21	[1]	$ 2.35	$ 4.36	[1]
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	241,689	239,545	[1]	241,133	239,693	[1]
Diluted earnings per common share:
Diluted earnings per common share	$ 1.09	$ 1.20	[1]	$ 2.31	$ 4.32	[1]
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	245,802	241,880	[1]	245,013	241,955	[1]
Dividends declared per share of common stock	$ 0.60	$ 0.48	[1]	$ 1.80	$ 1.44	[1]
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	998	763		2,349	2,011
Natural gas	94	105		357	394
Total utility operating revenues	1,092	868		2,706	2,405
Utility operating expenses
Utility cost of natural gas	29	40		130	175
Utility cost of electric fuel and purchased power	301	207		604	534
Utility operation and maintenance	309	255		852	756
Utility depreciation and amortization	128	108		359	316
Utility franchise fees and other taxes	55	48		144	138
Total utility operating expenses	822	658		2,089	1,919
Utility operating income	270	210		617	486
Equity (losses) earnings before income tax
Other income (expense), net	5	26		59	55
Interest expense	(49)	(37)		(124)	(104)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	226	199		552	437
Income tax (expense) benefit	(38)	(63)		(151)	(154)
Net income	188	136		401	283
Losses (earnings) attributable to noncontrolling interests	(12)	(21)		(23)	(6)
Earnings	176	115		378	277
Preferred dividend requirements	(2)	(2)		(4)	(4)
Earnings attributable to common shares	174	113		374	273
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	728	844		2,328	2,776
Utility operating expenses
Utility cost of natural gas	175	267		703	1,133
Utility operation and maintenance	316	331		933	946
Utility depreciation and amortization	91	83		268	246
Utility franchise fees and other taxes	27	28		91	94
Total utility operating expenses	609	709		1,995	2,419
Utility operating income	119	135		333	357
Equity (losses) earnings before income tax
Other income (expense), net	6	3		14	9
Interest income		1			1
Interest expense	(17)	(17)		(51)	(52)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	108	122		296	315
Income tax (expense) benefit	(37)	(41)		(105)	(106)
Net income	71	81		191	209
Earnings	71	81		191	209
Preferred dividend requirements	0	0		(1)	(1)
Earnings attributable to common shares	$ 71	$ 81		$ 190	$ 208

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