CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
REVENUES
Utilities	$ 2,091	$ 1,946	[1]
Energy-related businesses	292	488	[1]
Total revenues	2,383	2,434	[1]
Utilities [Abstract]
Cost of natural gas	(431)	(642)	[1]
Cost of electric fuel and purchased power	(388)	(171)	[1]
Energy-related businesses [Abstract]
Cost of natural gas, electric fuel and purchased power	(129)	(230)	[1]
Other cost of sales	(33)	(23)	[1]
Operation and maintenance	(671)	(639)	[1]
Depreciation and amortization	(257)	(230)	[1]
Franchise fees and other taxes	(96)	(95)	[1]
Utility operating expenses
Equity earnings, before income tax	12	1	[1]
Other income (expense), net	75	43	[1]
Interest income	5	3	[1]
Interest expense	(113)	(108)	[1]
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	357	343	[1]
Income tax (expense) benefit	(117)	(114)	[1]
Equity earnings, net of income tax	11	31	[1]
Net income	251	260	[1]
Losses (earnings) attributable to noncontrolling interests	(13)	(4)	[1]
Preferred dividends of subsidiaries	(2)	(2)	[1]
Earnings	236	254	[1]
Basic earnings per common share:
Basic earnings per common share	$ 0.98	$ 1.06	[1]
Basic earnings per common share, weighted-average number of shares outstanding (thousands)	240,566	240,128	[1]
Diluted earnings per common share:
Diluted earnings per common share	$ 0.97	$ 1.05	[1]
Diluted earnings per common share, weighted-average number of shares outstanding (thousands)	243,761	241,903	[1]
Dividends declared per share of common stock	$ 0.60	$ 0.48	[1]
San Diego Gas and Electric Company and Subsidiary [Member]
Utility operating revenues
Electric	671	665
Natural gas	163	175
Total utility operating revenues	834	840
Utility operating expenses
Utility cost of natural gas	67	83
Utility cost of electric fuel and purchased power	163	171
Utility operation and maintenance	268	273
Utility depreciation and amortization	112	103
Utility franchise fees and other taxes	46	47
Total utility operating expenses	656	677
Utility operating income	178	163
Other income (expense), net	30	16
Interest expense	(36)	(36)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	172	143
Income tax (expense) benefit	(60)	(49)
Net income	112	94
Losses (earnings) attributable to noncontrolling interests	(6)	(4)
Earnings	106	90
Preferred dividend requirements	(1)	(1)
Earnings attributable to common shares	105	89
Southern California Gas Company [Member]
Utility operating revenues
Total utility operating revenues	880	1,056
Utility operating expenses
Utility cost of natural gas	349	531
Utility operation and maintenance	289	288
Utility depreciation and amortization	87	81
Utility franchise fees and other taxes	36	37
Total utility operating expenses	761	937
Utility operating income	119	119
Other income (expense), net	4	3
Interest expense	(17)	(17)
Income before income taxes and equity earnings of certain unconsolidated subsidiaries	106	105
Income tax (expense) benefit	(40)	(37)
Net income	66	68
Earnings	$ 66	$ 68

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