CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUES
Utilities	$ 2,223	$ 2,170	$ 6,889	$ 6,099
Energy-related businesses	328	337	963	880
Total revenues	2,551	2,507	7,852	6,979
Utilities [Abstract]
Cost of natural gas	(261)	(212)	(1,182)	(864)
Cost of electric fuel and purchased power	(537)	(515)	(1,461)	(1,252)
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(120)	(136)	(325)	(346)
Other cost of sales	(47)	(43)	(144)	(117)
Operation and maintenance	(698)	(732)	(2,162)	(2,130)
Depreciation and amortization	(286)	(280)	(828)	(803)
Loss from plant closure	0	0	(200)	0
Franchise fees and other taxes	(96)	(89)	(283)	(264)
Gains on sale of assets	39	0	113	7
Equity (losses) earnings before income tax
Equity (losses) earnings before income tax, other	3	(94)	21	(375)
Other income (expense), net	16	44	79	137
Interest income	5	5	15	14
Interest expense	(137)	(126)	(413)	(352)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	432	329	1,082	634
Income tax (expense) benefit	(117)	(49)	(327)	(48)
Equity earnings, net of income tax	8	10	13	29
Net income	323	290	768	615
Losses (earnings) attributable to noncontrolling interests	(22)	(20)	(41)	(44)
Call premium on preferred stock of subsidiary	(3)	0	(3)	0
Preferred dividends of subsidiaries	(2)	(2)	(5)	(5)
Earnings	296	268	719	566
Call premium on preferred stock	(3)		(3)	0
Basic earnings per common share:
Basic earnings per common share	$ 1.21	$ 1.11	$ 2.95	$ 2.35
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	244,140	241,689	243,682	241,133
Diluted earnings per common share:
Diluted earnings per common share	$ 1.19	$ 1.09	$ 2.89	$ 2.31
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	249,259	245,802	248,723	245,013
Dividends declared per share of common stock	$ 0.63	$ 0.60	$ 1.89	$ 1.80
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	970	998	2,685	2,349
Natural gas	93	94	381	357
Total utility operating revenues	1,063	1,092	3,066	2,706
Utility operating expenses
Utility cost of natural gas	36	29	157	130
Utility cost of electric fuel and purchased power	315	301	776	604
Utility operation and maintenance	266	309	852	852
Utility depreciation and amortization	126	128	367	359
Utility franchise fees and other taxes	57	55	158	144
Utility loss from plant closure	0	0	200	0
Total utility operating expenses	800	822	2,510	2,089
Utility operating income	263	270	556	617
Equity (losses) earnings before income tax
Other income (expense), net	10	5	30	59
Interest income	0	0	1	0
Interest expense	(50)	(49)	(147)	(124)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	223	226	440	552
Income tax (expense) benefit	(84)	(38)	(147)	(151)
Net income	139	188	293	401
Losses (earnings) attributable to noncontrolling interests	(5)	(12)	(1)	(23)
Earnings	134	176	292	378
Call premium on preferred stock	(3)	0	(3)	0
Preferred dividend requirements	(2)	(2)	(4)	(4)
Earnings attributable to common shares	129	174	285	374
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	807	728	2,694	2,328
Utility operating expenses
Utility cost of natural gas	209	175	966	703
Utility operation and maintenance	314	316	936	933
Utility depreciation and amortization	100	91	280	268
Utility franchise fees and other taxes	29	27	95	91
Total utility operating expenses	652	609	2,277	1,995
Utility operating income	155	119	417	333
Equity (losses) earnings before income tax
Other income (expense), net	2	6	9	14
Interest expense	(17)	(17)	(52)	(51)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	140	108	374	296
Income tax (expense) benefit	(38)	(37)	(107)	(105)
Net income	102	71	267	191
Earnings	102	71	267	191
Preferred dividend requirements	0	0	(1)	(1)
Earnings attributable to common shares	$ 102	$ 71	$ 266	$ 190