OTHER FINANCIAL DATA - INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 32	$ (118)	$ 210	$ (1)
Effective income tax rate	11.00%	227.00%	32.00%
Income tax expense from corporate reorganization related to IEnova IPO			63
Income tax benefit related to life insurance contract holding period		54		54
San Diego Gas and Electric Company and Subsidiary [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	12	53	63	113
Effective income tax rate	14.00%	34.00%	29.00%	35.00%
Southern California Gas Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 45	$ 28	$ 69	$ 68
Effective income tax rate	27.00%	34.00%	29.00%	36.00%