CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Comprehensive income, net of income tax
Net income	$ 178	$ 251
Foreign currency translation adjustments	6	71
Financial instruments	(11)	3
Net actuarial gain	3	1
Total other comprehensive income (loss)	(2)	75
Total Comprehensive Income Before Preferred Stock Dividend Requirements	176	326
Preferred dividends of subsidiaries	(2)	(2)
Comprehensive Income Net Of Tax	174	324
San Diego Gas and Electric Company and Subsidiary [Member]
Comprehensive income, net of income tax
Net income	81	112
Financial instruments	3
Total other comprehensive income (loss)	3
Total Comprehensive Income Before Preferred Stock Dividend Requirements	84	112
Southern California Gas Company [Member]
Comprehensive income, net of income tax
Net income	46	66
Total Comprehensive Income Before Preferred Stock Dividend Requirements	46	66
Total Shareholders' Equity
Comprehensive income, net of income tax
Net income	180	238
Foreign currency translation adjustments	10	67
Financial instruments	(14)	3
Net actuarial gain	3	1
Total other comprehensive income (loss)	(1)	71
Total Comprehensive Income Before Preferred Stock Dividend Requirements	179	309
Preferred dividends of subsidiaries	(2)	(2)
Comprehensive Income Net Of Tax	177	307
Total Shareholders' Equity | San Diego Gas and Electric Company and Subsidiary [Member]
Comprehensive income, net of income tax
Net income	92	106
Total Comprehensive Income Before Preferred Stock Dividend Requirements	92	106
Noncontrolling Interests
Comprehensive income, net of income tax
Net income	(2)	13
Foreign currency translation adjustments	(4)	4
Financial instruments	3
Total other comprehensive income (loss)	(1)	4
Total Comprehensive Income Before Preferred Stock Dividend Requirements	(3)	17
Comprehensive Income Net Of Tax	(3)	17
Noncontrolling Interests | San Diego Gas and Electric Company and Subsidiary [Member]
Comprehensive income, net of income tax
Net income	(11)	6
Financial instruments	3
Total other comprehensive income (loss)	3
Total Comprehensive Income Before Preferred Stock Dividend Requirements	$ (8)	$ 6