CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, plant and equipment related to VIE	$ 473	$ 494
Long-term debt related to VIE	337	345
Shareholders' equity:
Preferred stock, shares authorized	50	50
Common stock, shares authorized	750	750
Common stock, shares outstanding	242	240
San Diego Gas and Electric Company and Subsidiary [Member]
Property, plant and equipment related to VIE	473	494
Long-term debt related to VIE	$ 337	$ 345
Shareholders' equity:
Common stock, shares authorized	255	255
Common stock, shares outstanding	117	117
Southern California Gas Company [Member]
Shareholders' equity:
Common stock, shares authorized	100	100
Common stock, shares outstanding	91	91