CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES
Utilities	$ 2,332	$ 1,838	$ 4,666	$ 3,929
Energy-related businesses	319	251	635	543
Total revenues	2,651	2,089	5,301	4,472
Utilities [Abstract]
Cost of natural gas	(365)	(221)	(921)	(652)
Cost of electric fuel and purchased power	(477)	(349)	(924)	(737)
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(94)	(81)	(205)	(210)
Other cost of sales	(49)	(41)	(97)	(74)
Operation and maintenance	(740)	(727)	(1,464)	(1,398)
Depreciation and amortization	(247)	(266)	(542)	(523)
Loss from plant closure	(200)		(200)
Franchise fees and other taxes	(81)	(79)	(187)	(175)
Gains on sale of assets		7	74	7
Equity (losses) earnings before income tax
Equity (losses) earnings before income tax, other	8	(293)	18	(281)
Other income (expense), net	26	18	63	93
Interest income	4	4	10	9
Interest expense	(138)	(113)	(276)	(226)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	298	(52)	650	305
Income tax (expense) benefit	(32)	118	(210)	1
Equity earnings, net of income tax	1	8	5	19
Net income	267	74	445	325
Losses (earnings) attributable to noncontrolling interests	(21)	(11)	(19)	(24)
Preferred dividends of subsidiaries	(1)	(1)	(3)	(3)
Earnings	245	62	423	298
Basic earnings per common share:
Basic earnings per common share	$ 1.00	$ 0.26	$ 1.74	$ 1.24
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	243,603	241,141	243,449	240,853
Diluted earnings per common share:
Diluted earnings per common share	$ 0.98	$ 0.25	$ 1.70	$ 1.21
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	248,515	246,260	248,279	245,766
Dividends declared per share of common stock	$ 0.63	$ 0.60	$ 1.26	$ 1.20
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	943	680	1,715	1,351
Natural gas	121	100	288	263
Total utility operating revenues	1,064	780	2,003	1,614
Utility operating expenses
Utility cost of natural gas	45	34	121	101
Utility cost of electric fuel and purchased power	252	140	461	303
Utility operation and maintenance	289	275	586	543
Utility depreciation and amortization	107	119	241	231
Utility franchise fees and other taxes	46	43	101	89
Utility loss from plant closure	200		200
Total utility operating expenses	939	611	1,710	1,267
Utility operating income	125	169	293	347
Equity (losses) earnings before income tax
Other income (expense), net	9	24	20	54
Interest income			1
Interest expense	(49)	(39)	(97)	(75)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	85	154	217	326
Income tax (expense) benefit	(12)	(53)	(63)	(113)
Net income	73	101	154	213
Losses (earnings) attributable to noncontrolling interests	(7)	(5)	4	(11)
Earnings	66	96	158	202
Preferred dividend requirements	(1)	(1)	(2)	(2)
Earnings attributable to common shares	65	95	156	200
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	904	720	1,887	1,600
Utility operating expenses
Utility cost of natural gas	303	179	757	528
Utility operation and maintenance	316	328	622	617
Utility depreciation and amortization	80	90	180	177
Utility franchise fees and other taxes	26	28	66	64
Total utility operating expenses	725	625	1,625	1,386
Utility operating income	179	95	262	214
Equity (losses) earnings before income tax
Other income (expense), net	3	4	7	8
Interest expense	(18)	(17)	(35)	(34)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	164	82	234	188
Income tax (expense) benefit	(45)	(28)	(69)	(68)
Net income	119	54	165	120
Earnings	119	54	165	120
Preferred dividend requirements	(1)	(1)	(1)	(1)
Earnings attributable to common shares	$ 118	$ 53	$ 164	$ 119