OTHER FINANCIAL DATA - INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 117	$ 49	$ 327	$ 48
Effective income tax rate	27.00%	15.00%	30.00%	8.00%
Income tax expense from corporate reorganization related to IEnova IPO			63
Income tax benefit related to life insurance contract holding period				54
Income tax benefit related to repairs deductions for first and second quarters of 2012		11		0
Income tax benefit related to repairs deductions for 2011 and first and second quarters of 2012		33
San Diego Gas and Electric Company and Subsidiary [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	84	38	147	151
Effective income tax rate	38.00%	17.00%	33.00%	27.00%
Income tax benefit related to repairs deductions for first and second quarters of 2012		11		0
Income tax benefit related to repairs deductions for 2011 and first and second quarters of 2012		33
Southern California Gas Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 38	$ 37	$ 107	$ 105
Effective income tax rate	27.00%	34.00%	29.00%	35.00%