DERIVATIVE FINANCIAL INSTRUMENTS 5 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Cash Flow Hedge Disclosure [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (21)
Maximum length of time hedged in cash flow hedge	16
Joint Venture Maximum Length Of Time Hedged In Cash Flow Hedge	18
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months For Noncontrolling Interest	(10)
San Diego Gas and Electric Company and Subsidiary [Member]
Cash Flow Hedge Disclosure [Line Items]
Maximum length of time hedged in cash flow hedge	6
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months For Noncontrolling Interest	(9)
Southern California Gas Company [Member]
Cash Flow Hedge Disclosure [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (1)